The barrel nut must be installed before the installation of the gas block and the collar and brake. You might not know Douglas for barrels, but if you are looking for perfection in your Mk12 build, you will want Douglas, and you will want the craftsmanship that Charlies brings you with Dougas, Allen Engineering, Potomac Armory and traditional gray GunKote, all in one package. MK12 barrels. I normally don't write reviews unless i have used the product. Never shoot a large caliber man with a small caliber bullet, WOA are usually around $270 and along with Larue Stealth, is the most accurate barrel I have seen shoot Black Hills MK262. One note: there are a number of super great quality companies who are making barrels and uppers and rifles that are Mk12 or Mk12 inspired. Best in the business. The SEAL Teams were apparently disappointed with the performance of the resulting Mk 12 Special Purpose Rifle (SPR), and convinced the program managers at Crane to return to the original specifications. From what I've found it sounds like Douglas made the barrel for the military Mk12 but Centurion Arms gets the same barrel as the mk12 from the same guy who cut them for the military. That kind of accuracy is enough for me. Mk12 Douglas 18" stainless steel SPR profile barrel, 1:7 5.56 NATO, Mk12 SPR 18" Douglas Stainless-Steel Barrel, Crafted by Compass Lake: Original Crane - Clone correct barrel for the Mk12 Mod0 and Mod1 SPR rifle, Douglas XX match grade air gauged buttoned rifled barrel, stress relieved for greatest accuracy, Barrel and rifled cut the exact same as originally deployed on the Mk12 Mod 0 and Mod 1, SPR profiled to accept the Ops, Inc #12 style brake and collar and suppressor, should you so choose, Profiled, chambered, crowned, gas port drilled and barrel extension installed by one of the best military spec barrel shops in the business: Compass Lake Engineering, 18.1" length barrel with rifle length gas system, correctly port sized as per Crane specs, 416R stainless for the ultimate in precision and also protection from the elements, CLE chambered (much like 5.56 NATO, but engineered for performance in the SPR by Compass Lake Engineering). 18" with rifle length gas system Posted: 5/29/2015 9:01:21 AM EDT [#1] Barrel Brand: Douglas-SS 7 Twist. As like most barrels at CLE LR.308 Barrel blanks are a custom order. If you are looking for perfection, this is your barrel. Thread: 18" SPR Barrel Thread Tools 01-28-07, 05:32 #1 Dave L. Senior Member Join Date Aug 2006 Location A-stan or MI or _________ Posts 3,652 Feedback Score 1 (100%) 18" SPR Barrel I am looking into doing a MK-12 Mod-0 SPR-type build and all I can find for barrels is a Noveski and a White Oak. On delivery timing, some barrels are in stock, and others need to be made, not to order, but in batches, and also tested and coated, so plan on a good 5 weeks for your barrel delivery. We have been in business since 1986 and are located in Alford, Florida. Good start so far #shortbarreledrifle. SKU: MK12B Availability: Typically ships in 2-4 business days. Here is our short list of barrels that will work wonders for you, already coated to spec, and we have included the Mk12 barrel and the Allen Engineering long or short collar, brake and thread protector. I went Centurion. I know the Centurion Arms is the real deal barrel and the same as the . These guys do magic with barrels, and Frank noted that the 18" barrel has caused issues over the years with excessive gas port erosion, but he has not seen that with Douglas. I would definitely recommend them to anyone. We also offer complete assembly service with a Mk12 gas block. White Oak Armament and Compass Lake Engineering are fantastic barrel producers. I dropped a prairie dog at 500 yards on Monday. Several brands were not in spec. Length: 18.1 17.9" 1:7 twist. I believe that his also includes the gas block, but I could be remembering that wrong. Description Special Purpose Rifle Contour Barrel. We cannot sample everything, but we feel that we sampled enough of what is on the market to make some strong endorsements for the barrels listed. They are business associates. 1:7 or 1:7.7 twist. This is my Mod Holland 16" variant. I opted for a WOA. This is for the purist. We have done the research. Douglas 1:7 twist StainlessSteel barrel, 18.1" in traditional gray. We strive to provide our customers with the best selection of rifles, barrels, accessories and offer custom work. 3/3/19, Review by $ 550.00 - $ 835.00 Add to cart Description Additional information Reviews (0) Description As like most barrels at CLE LR.308 Barrel blanks are a custom order. Additional information. If you like r/RetroAR but want modern stuff, this place is for you! They were awesome and really helpful. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. We also offer complete assembly service with a Mk12 gas block. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. The barrel is great, but think the shining point with this experience is the customer service. For most people, that is good enough. Only logged in customers who have purchased this product may leave a review. Length: 18.1" Gas System Length: Intermediate Length, Rifle Length. Douglas 1-8 Twist SPR/MK-12 Barrels 18.1 SPR/MK-12 Barrels 18.1: Criterion-SS Recon: Douglas-SS MID Gas System 2023 Daniel Defense LLC All Rights Reserved. We have been in business since 1986 and are located in Alford, Florida. What is best in life? They are probably correct. We coat barrels every month with Cerakote and Gunkote and coat other parts with Noreless' Moly Resin, Duracoat and Alumahyde. Overseeing this production is Potomac Armory, with a background in barrels and military weaponry. On pricing, some barrel kits might seem high, but keep in mind, you are getting the gas block, and the AEM muzzle kit, the barrel coating and Charlie's selection and handling, all in one place. The barrels measure 18 inches long. Many of which, we have tested, and there are some we have not. Last edited by tmanker; 06-08-17 at 19:35. It's constructed from a proprietary Stainless Steel blend with the chamber created during the Cold Hammer Forging process, which ensures the most precise alignment of the chamber to the bore possible. You might not know Douglas for barrels, but if you are looking for perfection in your Mk12 build, you will want Douglas, and you will want the craftsmanship that Charlies brings you with Douglas, Allen Engineering, Potomac Armory and traditional gray Gunkhole, all in one package. I've been sorting through barrels and found a supplier selling Mk12 Mod1 spec barrels made from Douglas blanks. . You can count on getting the right barrel. Note: barrels are typically in-stock, from time to time, there might be a short delay to coat your barrel in gray, if you opt that. Compass Lake Engineering has been serving customers all over the United States for over 30 years. Theyve earned my business and Ill continue to buy from them. 2/18/19. When we are building a Mk12 we want everything just right. M4 Feed Ramps come standard. All times are UTC - 8 hours Description Special Purpose Rifle Contour Barrel. Charlie's has spent time at Frank's shop at Compass Lake. Best in the business. Ron Allen has supplied the SPR profile to any barrel maker who chooses to follow. My experiences with Frank, Theresa and Paul have been top shelf. The Brownells 5.56 NATO MK12 Profile AR-15 barrel are completely machined and finished by craftsmen in the USA and are made using stainless-steel bar stock that's 416-R certified steel and completely stress relieved. Ready to Ship: Douglas SPR/MK-12 Skip to the beginning of the images gallery. That is what I would choose.. High Caliber Sales sells the same spec barrel. M4 Feed Ramps come standard. 06-09-17, 12:50 #10. No hard feelings. to shrink it's diameter (the gas block should not be chilled). Why Gunkote? SKU: 05-556-18DB-7 $504.00 Current Stock: Out of stock Out of Stock Add to Wish List Description Douglas 18" barrel is constructed of 416 Stainless with black Cerakote finish. Also, there are some rifle and barrel brands out there that are not trying to be clone correct. Threads: 1/2-28 This barrel comes with M4 Feed Ramps, Rifle gas system, 1/2-28 threaded muzzle, and the proper OPS, Inc. muzzle contour for OPS, Inc. collar. All the barrels would accept the Mk12 gas block from either Daniel Defense or BadgerOrdnance. The price is reasonable, and I was wondering if anyone has used them? If the gas block will not easily slide onto the barrel, use sandpaper, emery cloth, or (my favorite) a Dremel tool with a half inch sanding disk to open up the inner surface of the gas block. The quality was top knotch the fit and finish was everything you want from a high level barrel. I highly recommend this barrel in any MK12 build. Charlie's also offers the complete Mk12 barrel kitif you want the Allen collar and brake. Especially 10.5 and 11.5. I've got a Douglas SPR barrel turned from CLE with the CLE chamber that I'm very pleased with. I've got Douglas and Krieger SPR 18" barrels, both with OPS 12th 556 suppressors, and it takes a hell of a good day to tell that the Krieger is better. Posted: 5/29/2015 8:35:37 AM EDT just wondering what people find works great as a mk12 barrel? This is considered a semi-permanent installation. Charlies is offering three different barrels. So, Charlies brings you the short list of barrels that perfectly fit. I would definitely recommend them to anyone. MK12 barrels. Recommended Barrels For Mk12 Clone? Chamber Type: CLE, Wylde. If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible. You should not take away that if that barrel is not listed that it failed our testing. As Bill said in a previous reviewit does not get better then that. JavaScript seems to be disabled in your browser. CLE chambered (much like 5.56 NATO, but engineered for performance in the SPR by Compass Lake Engineering) . ''Hokey religions and ancient weapons are no match for a good blaster at your side, kid.''. This results in the suppressor making two few turns, and the alignment against the collar is not quite right, or to make it right resulting in far too much shimming and far too little of the barrel thread actually inside the suppressor. Very helpful and quick to respond on any questions I had. I'm running a Centurion on my DMR build (used for DMR comps, not a Mk12 clone) and am VERY happy with it. I also had the FSB pinned and also opted for the Ops Inc and to say Im pleased is an understatement. Went in to get the barrel threaded for my 17hmr and walked back out with it 20 minutes later. Privacy Policy. Many barrels will fit the gas block and the Allen collar and brake. Most customers will choose to purchase the rail with the barrel if Charlie's is installing the kit, but if you have a rail, you can send us the barrel nut separately. This results in the suppressor making two few turns, and the alignment against the collar is not quite right, or to make it right resulting in far too much shimming and far too little of the barrel thread actually inside the suppressor. Share this: SPR/MK-12 Barrels 18.1: Criterion-SS Our Douglas barrels are contoured and chambered by Compass Lake Engineering. PK Firearms 1055 Co. Hwy 6 Shelbyville, IL 62565 Phone: 217-774-5810 Fax: 217-774-5814 sales@pkfirearms.com Its an amazing barrel. Out of several tests loads, I saw groups ranging from 1/2", 7/16", and 3/8" at 100 yards with different load calculations and projectile manufactures. 1:7 or 1:7.7 twist This barrel comes with M4 Feed Ramps, MID Length gas system, 1/2-28 threaded muzzle, and the proper OPS, Inc. muzzle contour for OPS, Inc. collar. Best option for long range, high precision shooting. Several brands were not in spec. They got me squared away quickly with a fantastic looking upper and quickly. Oh, you might also need the right handguard, optic, stock, bipod and rings. The Criterion is leading because of the price and I've heard good things about the cuts at Compass Lake. No clue why PRI doesn't have their barrels in stock anymore sadly, they're usually the most commonly used ones. ADT Sergeant. This is 100% clone correct. Builder's Note: If you are going to mount a Mk12 gas block, be sure that the inside diameter is, no less than, 0.750. Now, in talking to Ron Allen, he explained that he has been seeing a number of baffle strikes in his suppressor, but upon further research, the problem was one of two things: 1) some rifle manufacturers were having the Ops Inc collars and brakes make by another vendor, or maybe they were making the brakes and collars themselves, but Ron tells us that they were not in spec, and were not Allen Engineeringproducts. These are Crane Spec. Generally, this means that the measurement of the end of the threads to the shelf point where the collar attaches was not the correct distance. This is 100% clone correct. Leveraging Compass Lake Engineering, with their long heritage both to the US Navy and to competitive shooters around the USA provides you with one of the best combination of barrel blanks and craftsmanship anywhere. Maybe, but this is a good start. Hey everyone, I'm building a Mk12 Mod1 for a little precision work. Thank you for your amazing workmanship. 1:7 Twist. The gas blocks are available for purchase, but not included in the base price, Charlie's also offers installation of the complete kit with the gas block and your barrel nut, or the entire upper receiver with your rail for an additional fee, For the Mod 0, we will install the PRI folding gas block and time the cross bolt pins, and use a thread locker on the screws, but you will still be able to remove or adjust the hex head screws, which was often used by snipers to adjust for windage. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. We cannot warranty items damaged by improper installation. Mk12 SPR 18" barrel kit for Mod 0 and Mod 1 rifles. What we have listed will fit the bill for Mod0 or Mod1 builds. You are using an out of date browser. Charlie's also offers the complete Mk12 barrel kit if you want the Allen collar and . Each coating has its own best practice applications. What makes each of Daniel Defenses three most popular picatinny rifles unique. I haven't looked into WOA, Green Mountain or Ballistic Advantage but I will now. Crafted by Compass Lake: Original Crane - Clone correct barrel for the Mk12 Mod0 and Mod1 SPR rifle . Charlies has spent time at Frank's shop at Compass Lake. Description Special Purpose Rifle Contour Barrel. Jwknutson17 . The barrel comes with M4 feed ramps a 1/7 twist and top quality MOA accuracy. We have not yet addressed the Mod H or the NSW Recce. That will be another topic. Centurion Mk 12 AVRE 105 Ex-Forward Artillery Observer vehicles converted to AVRE role. One new winner* is announced every week! First offCenturion Arms is a great company. Centurion Arms MK12 Rifle Barrels are the result of development done by the U.S. government to give Special Operations forces the best possible weapon system. We have an extensive collection of rifles, barrels, and accessories, as well as offer custom work. I have the BA one chambered in wylde and 1/8, which I think is the best chamber and twist for accuracy.. I couldnt write enough to convey their integrity to you here but when you spend money with Centurion rest assured that your money is truly going to people who deserve it. No for the barrel itself. I wish DD made this exact barrel profile for every length rifle. My Douglas barreled SPR built by CLE was the most accurate gas gun Ive ever owned. To get the suppressor of a Mk12 / Ops Inc / AEM-5 aligned properly is a very delicate and technical task. See link, if that is something that interests you. Florida. These barrels are the result of tens of thousands of dollars in development done by the U.S. government to give our Special Operations guys the best weapon system they can have. We have spoken with many riflemen who have used these barrels and carried them in combat and have found unanimous satisfaction with their reliability and accuracy. Douglas barrels are made from 416 Stainless Steel and button rifled. Douglas barrels are made from 416 Stainless Steel and button rifled. : Gas Tube: None Gas Tube - Carbine Gas Tube - Midlength Gas Tube - Rifle We are a veteran-owned and operated company. Joey Dalton. Folks, now it just dont get much better than that. Went in to get the barrel threaded for my 17hmr and walked back out with it 20 minutes later. ), PINNED AND CERAKOTED OPTION AVAILABLE HERE. Copyright 1996-2023 AR15.COM LLC. https://www.AR15.Com/media/mediaFiles/116042/20161220-123528-170093.JPG. Erich, Posted on The barrel is solid and perfectly machined. We have purchased a number of popular barrels and put them through the test to see if we could fit the Ops, Inc or Allen Engineering collar and brake on the barrel, and then attach the AEM-5 / Ops Inc. #12 suppressor on the barrel with collar and brake setup. CLE/Douglas barrel is basically a shorter MK12 barrel, these guys made plenty of barrels for the army, if you know you know, if not do a google You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. You benefit from our research, our testing, and clone ready barrel. It is possible to remove the gas block, but often times the removal requires the drilling out of the set screws and sometimes destroying the gas block threads in the process. For the Mod 1, we will install the Mk12 gas block first by dimpling the barrel, then timing and setting the gas block and installing the set screws and applying red Loctite. The "XX" grade match barrel that Douglas produces is the same rifling done for the US Navy Seals and US Marines in the early phase of the Global War on Terror. Mk12 SPR 18" Douglas Stainless-Steel Barrel. You might like another barrel. For the best experience on our site, be sure to turn on Javascript in your browser. Note: One picture shows the Mk12 gas block installed. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Charlie's also offers installation of the complete kit with the gas block and your barrel nut, or the entire upper receiver with your rail for an additional fee. Bottom line, we use it because it is historically correct. Thread: None, 1/2 . That said I would've preferred not to have had to use it. 1:7 Twist This barrel comes with M4 Feed Ramps, Rifle gas system, 1/2-28 threaded muzzle, and the proper OPS, Inc. muzzle contour for OPS, Inc. collar. Ive had this barrel for four years now and am extremely happy with the accuracy and performance. The suppressor rests on on the collar, but then is threaded inside the suppressor onto the external threads on the brake. Extremely tight fit into the upper receiver. Shipping - Timing, International, Restrictions, Returns, Order Cancellation and Price Changes, Mk12 SPR 18" barrel kit for Mod 0 and Mod 1 rifles, Daniel Defense Mk12 SPR 18" 5.56mm barrel, PRI 18" Mk12 Mod 0 SPR Gen III Rifle - A2 Stock 5.56 1:7 in FDE, Douglas 16" Stainless Steel Mk12 Mod H Profile Barrel, 5.56, 1:7 Twist, Mk12 Holland 16" Barrel Kit For Mod H Rifles, Mk12 Mod 1 Near Clone Upper Receiver Group, complete from Potomac Armory, Allen Engineering AEM-5 "Ops Inc. #12" Mk12 SPR collar and adapter (long), Mk12 Mod 1 Near Clone Premium Upper Receiver Group, Complete, Knights Armament KAC Free Float Rifle RAS, Mk12 Mod1 KM-21318, Allen Engineering AEM-5 Suppressor for Mk12, RECCE, and Gordon Rifles - 2022 Model. I previously had two different Rainier Ultramatch barrels that I couldn't get to shoot sub MOA. We have shortlisted four barrels, with hardware and gray or black coating ready to go. Charlie's is here to help. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. The collar will be properly installed, and the brake will be timed and set in place with rockset. The store will not work correctly in the case when cookies are disabled. The end of the barrel comes with 1/2-28 thread for brakes or flash hiders. Ready to Ship: Douglas-SS SPR/MK-12 Barrels 1-7 Bergara 1:8 twist Stainless Steel barrel, 18.0" in traditional gray. Scan this QR code to download the app now. Thank you CLE! You must log in or register to reply here. If you do not need a suppressor, don't sweat it. We have an extensive collection of rifles, barrels, and accessories, as well as offer custom work. SPR/MK12; Tactical; Varmint; 6mm ARC; 6.8 SPC II Barrel; 22 Nosler Barrel.224 Valkyrie Barrel; . Length 18.1 I am going to put the Ops Inc. brake and collar on and eventually get the can to go along with it. We have spoken with many riflemen who have used these barrels and carried them in combat and have found unanimous satisfaction with their reliability and accuracy. The service fee for the Mod 0 is $100, and you can. Any use of this content without express written consent is prohibited. 2) the profile of the barrel was not to spec, and generally, the distance from the muzzle to the collar step was too short. Monty Leclair of Centurion (to my knowledge) is the only public source for true Mk12 Douglas barrels built to Crane specs. Very happy. Generally, this means that the measurement of the end of the threads to the shelf point where the collar attaches was not the correct distance. Probably Cerakote does a slightly better job with barrels, but Gunkote is with NSWC Crane used for the early SPR program in 2000 to 2010, and the higher temperature curing does a very good job. Douglas-SS 1-8 SPR/MK12 18.1 $ 400.00 Select options Criterion-SS 1-7 SPR/MK12 18.1 $ 340.00 Select options Criterion-SS 1-7.7 SPR/MK12 18.1 $ 340.00 Select options 1 2 3 4 6 7 8 If you are building a Mod 0, you will want to need the PRI Gen1 flip-up sights with the cross-bolt installation. Failure to do so could result in a "smoothing" of the painted surface just forward of the gas block (i.e. Charlies does really understand why. You get what you pay for. If you are looking for perfection, this is your barrel. Some will ship in 1 or 2 weeks, some in 5 to 8 weeks. $370 Kreiger Mk12 SPR barrel. If you want to build your Mk12 to be historically, correct, then we are your huckleberry. For a better experience, please enable JavaScript in your browser before proceeding. There are probably barrels, other than what we have listed that will work just fine. Mike, Posted on Some took some effort, some allowed the gas block to slide right on. These barrels, some of the most accurate and durable barrels attainable, are DLC . Instructions are very detailed as to how to time the Allen brake. All Rights Reserved. Criterion 1:7 twist Stainless Steel barrel, 18.0" in black. and custom chambered and profiled by Compass Lake Engineering, then custom coated with GunKote by Potomac Armory. 29 views, 2 likes, 1 loves, 0 comments, 0 shares, Facebook Watch Videos from Keepfiringllc: KF 11.5 SBR W C.L.E/Douglas/Mk12 blank, 287 and 384 yards. Your choice of natural stainless or sprayed on Crane Navy gray Gunkote, and baked and cured, just like the original Mk12 barrels for the US Navy in 2000. if you want the Allen collar and brake. - AR15.COM AR-15 Rifles, Uppers, Lowers, Barrels, and more [ARCHIVED THREAD] - Recommended Barrels For Mk12 Clone? We also have complete kits with Allen Engineering hardware and options Mk12 gas blocks. Some did. M4 Feed Ramps come standard. USAMU and Lexington Blue Grass ARSOF Depot used Douglas blanks with some work done by Gene Barnett and the AMU Shop. We have been in business since 1986 and are located in Alford, Florida. Compass Lake Engineering turns Wilson blanks to their specs for them. Some gas blocks have an excess finish on the inside surface. Another trick is to place the barrel in a freezer for 10 min. They were both returned under warranty, and the Rainier customer service was excellent. If you look around you can sometimes find a new one for sale for high $300's. Great Company! Douglas Mk12 SPR barrel. Douglas still makes a superior barrel and using 416R stainless provides a nice mix of corrosion resistance and accuracy. White Oak Armament barrels are worth more than what they ask for them. Where are some good places to find a barrel? The MK12 barrel is engineered with a rifle length direct impingement gas system and is a solid choice for your AR-15 Build. We have been in business since 1986 and are located in Alford, Florida. Barrels Barrels PRi AR15 Barrels. However, I have nothing but high praises for Paul and Theresa at CLE. Showing 1-6 of 6 item (s) Sort by Relevance Active filters Douglas 5.56 Caliber Barrel 16" - 1-8 Twist 05-556-16DB-X $489.00 Douglas 5.56MM Barrel 16" - 1-7 Twist 05-556-16DB-7-X $504.00 Douglas 5.56 Stainless Steel Barrel 18" - 1-8 Twist 05-556-18DD-X $504.00 Douglas 5.56 Stainless Steel Barrel 18" - 1~7 twist We can cut to the chase. Good people to talk with and they will genuinely help you. This is for the purist. PRI and CCC are most common, but they both source their barrels from Douglas and have CLE contour and chamber. We have invested a lot of time and inventory and research into Mk12 barrels. Here are the options I've seen out there: How close of a clone are you trying to make? MK12 Mod 0 SPR, .22LR Compass Lake My CLE really likes Wolf ammo, I haven't had much luck with anything else. AZ: Land of wind, dirt and angry old people, https://charliescustomclones.com/mk12-douglas-stainless-steel-spr-profile-barrel-1-7-5-56-nato/, https://charliescustomclones.com/mk12-spr-18-barrel-kit-for-mod-0-and-mod-1-rifles/, WTS- Mk12 Mod 1 HCS built upper with Leupold Mk4 2.5-8x. This barrel comes with M4 Feed Ramps, MID, Intermediate Length or Rifle gas system, 1/2-28 threaded muzzle, and the proper OPS, Inc. muzzle contour for OPS, Inc. collar. *** We recommend gunsmith installation for all of our parts. Its very clean and the Cerakote well executed. 2) the profile of the barrel was not to spec, and generally, the distance from the muzzle to the collar step was too short. Douglas MK12 barrel, gas block/tube and Ops Inc brake and collar. My Mk12 barrel shoots 4 rounds in a 3/8" cluster at 100 meters on its first trip to my range. Thank you CLE! JavaScript is disabled. All would accept the Allen Engineering long or short collar and the brake with shims. To crush your enemies, see them driven before you, and to hear the lamentation of their women! Shipping - Timing, International, Restrictions, Returns, Order Cancellation and Price Changes, PRI Mk12 Mod0 SPR Top "Swan" Rail for PRI Gen II Round Rifle Length Forearms (05-SPR-G2), Mk12 Douglas 18" stainless steel SPR profile barrel, 1:7 5.56 NATO, PRI 18" Mk12 Mod 0 SPR Gen II URG 5.56 1:8 in FDE, Mk12 Holland 16" Barrel Kit For Mod H Rifles, PRI Mk12 Mod0 SPR Top "Swan" Rail - Dark Earth - Gen 2 (05-SPR-G2DE), Allen Engineering AEM-5 "Ops Inc. #12" Mk12 SPR collar and adapter (long), Mk12 Mod 1 Near Clone Upper Receiver Group, complete from Potomac Armory, Mk12 Mod 1 Near Clone Premium Upper Receiver Group, Complete, Allen Engineering AEM-5 Suppressor for Mk12, RECCE, and Gordon Rifles - 2022 Model, Douglas 16" Stainless Steel Mk12 Mod H Profile Barrel, 5.56, 1:7 Twist, Mk12 gas block - Crane NAVSPEC model phosphated steel 0.75" from Potomac Armory. These guys do magic with barrels, and Frank noted that the 18" barrel has caused issues over the years with excessive gas port erosion, but he has not seen that with Douglas. If Krieger is an option, Krieger is the answer. A couple believes they've located a once lost shipwreck in the shallow waters of Lake Michigan. The collar will be properly installed, and the brake will be timed and set in place with rockset. As always it did not let me down. We are comfortable with the four barrels we have listed, and stand by them. We have an extensive collection of rifles, barrels, and accessories, as well as offer custom work. I will say that using the clone correct flashsuppresor and suppressor collar fits perfectly. Its constructed from a proprietary Stainless Steel blend with the chamber created during the Cold Hammer Forging process, which ensures the most precise alignment of the chamber to the bore possible. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. . Now, in talking to Ron Allen, he explained that he has been seeing a number of baffle strikes in his suppressor, but upon further research, the problem was one of two things: 1) some rifle manufacturers were having the Ops Inc collars and brakes make by another vendor, or maybe they were making the brakes and collars themselves, but Ron tells us that they were not in spec, and were not Allen Engineeringproducts.