Bolt Material: 9310 Steel Carrier Finish: Black Nitride A different 9MM buffer is needed and possibly a higher quality buffer spring. I read the title (What can cause a bolt to get stuck?) ORION TRAINING GROUP; It is stuck! Stupid failure on my part, although I don't know that it would have changed anything. About Women's Health Newsletter Customer Care Advertise Media Kit Other Hearst Subscriptions Subscribe Give a Gift. Any way you could get a screwdiver in there and move it forward. Because the BCG is half an inch or so into the buffer tube, I can't separate the two halves. Shop Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group | 17% Off Customer Rated on 11 Reviews for Faxon Firearms 5.56/300BLK M16 Bolt Carrier Group On Sale + Free Shipping over $49. If the bolt carrier from the problem rifle works fine in the non-problem rifle, but the bolt carrier from the non-problem rifle binds in the problem rifle, we've eliminated the bolt carrier as the problem. Thanks for the replies. You're currently reading page 1; Page 2; Page 3 . The bolt carrier group is also a part of the upper receiver to an AR-15. My rifles get some smoothing prior to shooting. View More. If you do that, remve the end plate slowly so the spring and detent for the take down pin doesn't come flying out. 1. When you took it apart, was the buffer spring staying in the buffer? ATTN: Here is the link to a new higher quality and more informative video I made showing this technique and explaining what I think causes it, and how to keep the issue from happening again.https://youtu.be/S_wLVeBOJgII show how to use the mortar technique and simulate how my AR-15 bcg locked up with a round chambered and a bolt carrier group that wouldn't budge. The majority of weapon failures stem from issues with the bolt carrier group, and a good bolt carrier group can keep the failures to a . You could try to remove the buffer tube. IMHO simplest answer is your BCG is that nickel boron type and could possible be on the thick/over finished side and if that's coupled with a bolt that's a hair on the overcut sized=lock up in my opinion. Pros: Looks great; Cons: Out of tolerance/no QA; Best Used for: Door . IN STOCK. Safety Guideline's for using this technique3:30 Outro Compete against real players in the multiplayer racing. 56 Bolt Carrier Group 158 Carpenter SP/HPT/MPI | Sons Of Liberty Gun Works BCG. Well I would completely take that BCG apart and wash and clean it up good, then lube real well, it looks dirty to me, I don't clean my guns every time I shoot them and none of my BCG's look that dirty, also being a Sharps BCG, I would pick up a back up BCG. Stuck Bolt Carrier Group. Use a quality recoil spring. You dont need any tools to break down the bolt carrier group for detailed cleaning.Website Article: https://kydexowbholsters.com/how-to-disassemble-clean-an-ar-15-rifleFor detailed Ejector and Extractor Disassembly, go to: https://kydexowbholsters.com/how-to-disassemble-an-ar-15-bcg-bolt-carrier-groupLinks in this description are affiliate links to help support the channel. Now that the kinks seem to be worked out, I'm hoping to test the reliability of this nickel boron bolt to see if it really runs dirty as all the manufacturers claim. Try the Mortar thunk first, I forgot about that. Back to old site If there is anything in your cart, it will not be brought over to the old site. I use mid range reloads so I couldn't figure why it would be jammed.. here is the album of photos, let me know if there are any others i should include: http://imgur.com/gallery/ezQxC. most likely the cheap amazon prime sights thats killing your gun. S197 Gunny Sergeant Full Member Minuteman . BCA's Bolt carrier groups are MPI inspected. In your post i noticed you said you pulled the barrel and someone else pulled the charging handle. Pull the Bolt back to extend it and turn the Cam Pin 90 degrees. This video will show you how to disassemble your Sig Sauer P320. The standard bolt carrier group consists of a bolt carrier, bolt, firing pin, gas key, cam pin, and firing retaining pin. I am beyond OP's return dates. Right to Bear Arms and Supply proudly sells these core components from top-of-the-line brand names, including Anderson Manufacturing, Rock River Arms, Spike's Tactical and WMD Guns. Add to Wish List Add to Compare. In Stock. Foreign debris, some random smashed small roll pin (not an AR part) fell out the muzzle after trying the nose-slam suggested in comments. $154.99 On sale: $144.14 In Stock. $162.54. Well, despite my shoulder, I went to the range yesterday. That's really dirty. Did you run polymer coated ammo by any chance? $249.00 On sale: $217.95 In Stock. I'm not sure. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. Fortunately the solution and prevention are pretty easy. Should I try freeing it up myself, or take it to an armorer? I removed the casing and re-assembled. Short and to-the-point Video: AR-15 Bolt Carrier Group Disassembly (BCG) and Reassembly is really easy when you know what to do. Maybe try a good hard hank on the Charging handle. Don't think so. Arm or Ally AR15 / M16 5.56 NATO Bolt Carrier Group - Black Nitride. I believe my recoil spring is binding inside the bold carrier when I pull the charging handle all the way to the rear. Sharps Xtreme Performance Bolt Carrier Group (Successor to the Relia-bolt) stag ambi charging handle faxon 14.5 midlength pencil barrel Geissele MK8 SLR Sentry 7 Gemtech Trek . Well, I am sitting in front of the tv anyway doing nothing. Look for the shiny spots in the upper caused by the bolt carrier. B2-K630-A001-0P. Carpenter . 227-GTBCG | Guntec. Free Account glitch cars Please share with your friends . and responded with an answer, because my bolt (well entire carrier really) did in fact get stuck in the open position due to the casing/ejection jam. Going back to the question of whether or not the upper from the problem rifle works fine with the non-problem lower, if it does, then the issue might be tolerance stacking. Without question the biggest malfunction 9MM AR shooters experience is a broken bolt stop, broken bolt catch. I was able to separate the upper from the lower. Or, You might have a burst shell casing that's hung up on the Bolt. You want reliable function, be reliable and clean it after you shoot it and keep it in top working condition. . AR15 5.56 Bolt Assembly Nickel Boron $ 109.95 $ 74.95 SALE. How did you install the barrel? If he only fires his own reloads . I do not run "wet" and rarely clean with less than 500 rounds fired since the last clean/lube. Use a Flathead screwdriver in the middle of the circular cut out on the Handle and give it a tunk. Don't forget, you can always check for a live round in the chamber by inserting something down the barrel and seeing where it stops. Method 1: Change Your Buffer Spring. Does the BCG move freely into the upper without the lower? I have also traded out the charging handles on both rifles and have tried all combinations of BCG's and Charging handles on both rifles with no differences made, so the charging handle seems to be alright. Step One: Complete AR15 Disassembly - Bolt Carrier Group. Put a heavy lube application on the 4 rails, on the gas rings, on the cam pin, the forward and rear facing lugs of the bolt, a smidgen on the firing pin, and one drop of oil worked into the ejector. LANTAC E-BCG Nickel Boron Enhanced Bolt Carrier Group EBCG (2) Sale. 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. Do I need to remove the buttstock? I do, however, keep the barrel extension and chamber relatively clean. A call to armalite confirmed this. October 18, 2019 1:01 pm Reply tangofoxtrot. Like really difficult? The carrier then moves forward creating a double feed and jamming said casing into the outside edge of the feed ramp (I think?). BCA AR-15 Bolt Carrier Group Black Nitride. https://www.facebook.com/SemperParatusArms/, http://www.semperparatusarms.com/cou-registration/, http://www.m4carbine.net/forumdisplay.php?f=141, MISC Training Course Announcements & AAR's, Former Vickers Shooting Method Regional Instructors, Pacific Northwest Training and Networking, All Other Longgun Parts, Accessories, & Magazines (EE), Handgun Parts, Accessories & Magazines (EE), If this is your first visit, be sure to Pushed on it and heard it click. Get an AR-10 bolt carrier group and get to shooting. Add to Wish List Add to Compare. Good luck! Strangely enough, the problem BCG works perfectly in my personal AR. This over-travel condition allows the 9MM AR Bolt to travel too fast in the forward direction causing premature failure of the bolt catch. Its an American Tactical upper and an 80% built lower. Toll-Free: +1-800-504-5897 Live Chat Help Center Check Order Status. LANTAC 223/5.56 E-BCG Full Auto Style Bolt Carrier Group - Nickel Boron. Lube those too. The gas key is staked on both sides of both bolts. Reactions: ken4570tc in WY. TFB Review: Sharps Xtreme Performance Bolt Carrier Group. Something wedged in there is your culprit and knowing what gives you an idea of what you are up against. stock trigger has a heavy pull and even heavier . bolt carrier group could lack enough force (generated by the expansion of the action spring) to feed, chamber, or lock the bolt . I would just take off the castle nut and unscrew the buffer if nothing else. The Blackout, dimensionally, is identical (for all intents and purposes) to the .300 Whisper, developed by J.D. Did I totally screw it up? Disassembly of my Sig p320 compact. Use common sense. Car parking multiplayer gearbox tips. [ARCHIVED THREAD] - What can cause a bolt to get stuck. When I let the BCG go forward, won't go into battery enough for the BCG to clear the buffer tube. And when this happened to me it ruined my day of shooting and did know how to fix the issue until later when I got back from shooting and looked up solutions on the internet and it took me many searches to find this method so I figured I would pay it forward and upload a video of my own to help other ar15 owners in case they need to ever perform this technique and get their rifle back to working order. $289.95. Turn the Bolt, aligning the larger opening with the Bolt Carrier opening just below the Carrier Key. All AR-15 platform rifles have a Bolt Carrier that disassembles the same way.AR-15 Tools \u0026 Cleaning kits: https://amzn.to/3rzvOQdLearn to quickly and easily break down the bolt carrier and remove the extractor for cleaning.Firearms Legal Protection available for as little as $9.95/mo! It houses your firing pin and extractor, which are the key components that make your firearm fire and cycle correctly. Then point the muzzle straight up and rap the butt sharply on the ground. I know, dumb as he.. and not paying attention. We offer bolt carrier groups for various AR-15 builds. Than, lift the rifle up about 1 foot or so and bring it onto the ground with considerable force. Rating: 97% Regular Price $139.99 Special Price $99.99 $79. Copyright 1996-2023 AR15.COM LLC. Otherwise it was three short groups with three to five minutes in between. No wonder it is locking up. Carrier Style: Standard. My experience is that when a bolt locks up, with nothing in the chamber, it's always been a popped primer/anvil in there, and they often fly out when you jack it open. Harry from UBR Tech gave a tutorial on how to disassemble and reassemble a Sig P320This video is to show you how to assemble and disassemble purposes of repa. Carrier looks dirty as he'll. Sometimes if the cotter pin is put in wrong it can catch. !2:14 My theories and speculation as to what causes this malfunction to happen2:51 Asking for viewers opinions on what causes this common malfunction3:20 IMPORTANT!! /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. That would meen that chamber has never seen a steel case . Do this a couple times and it should free your BCG up. Gun looks really dirty and dry as a popcorn fart to me, clean and lube it. Only $ 149.99. Installed the safe door with 4 guys lifting it up as it weighs 500 pounds. Toolcraft Black Nitride .224 Valkyrie/6.8 SPC Bolt Carrier Group (AR15/M16)-MPI Tested This item is currently on order MSRP: $149.95 . The charging handle moves back and forth easily now. 7.62 x 39mm Caliber Bolt Assembly Nitride $ 99.95 $ 69.95 SALE. Well, when I had it apart earlier the buffer spring was staying in the buffer tube. I think I broke my gun. Did you see the FBMG Saiga 308 threads or the AGP threads holy lord. 99 Save up to 20% when you buy more Buy It Now Top Rated Plus. Press question mark to learn the rest of the keyboard shortcuts. 1. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. Can't say I'm in favor of "mortaring" the rifle. Specs: Mil-spec Carpenter No. The image below gives a nice breakdown of the parts in a typical BCG. This slightly wears in the parts and gas rings and makes the initial rounds chamber and eject easier. If you didn't spray it down with brake cleaner or something prior to snapping the photo, that thing is beyond dry looking to me. but i thought i would post this as a detailed guide. Perfect for your next .308/.243/6.5 Creedmoor Rear Charging AR-10 build. Clean the friggin' thing and lube it. Reason One - A 9MM AR Bolt is shorter than a milspec AR-15 Bolt Carrier Group. You are using an out of date browser. I know it seems a bit harsh, but it works, it's what the military has been doing for years. You have significant carrier movement prior to any unlocking/bolt rotation. If you have any experience to offer send us a message. As the BCG moves rearward with the bolt and cam pin held in place, the machined slot in the BCG that the cam pin rides,acts on the cam pin and rotates the bolt until the bolt lugs clear the extension allowing the bolt to move rearward. Soaking wet. Best AR-15 BCGs. The AR-15 bolt carrier group contains vital components for proper functioning of your firearm. I did the mortar maneuver. Radian Weapons Enhanced Bolt Carrier Group (BCG) $ 210.00 Read more; Radian Weapons Takedown Pins Kit - AR15 $ 32.95 - $ 54.95 Select options; Keep In Touch. Conclusion To prevent a 9MM AR Broken Bolt Catch select a 9mm AR buffer that is at least 3.600 inches long and weighs more than 5.5 ounces. Colt AR6951 Bolt Catch is the only dedicated 9MM Bolt Catch that I am familiar with.and know of. what lower? I was function checking the movement of the bolt and thats when i ran into the problem. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. Just bought a AR15 carbine on sunday. The AR-15 bolt carrier group, or BCG, is a critical and often misunderstood piece of the AR-15/M16 upper receiver. Or stuck on an empty chamber? In Stock. So I was shooting my AR last week, and it was functioning fine. One new winner* is announced every week! Solution Part Two Some shooters have reduced recoil and improved reliability buy using a 9mm AR buffer that in addition to being longer than standard 9mm AR buffer it is also heavier. The bolt has seized inside the carrier in the forward/fully extended position. I had a broken decapping pin from a reloading die end up in my chamber once. Also have you tried to lightly let the charging handle go forward just to see how easy it is for a round to go into battery? Copyright 1996-2023 AR15.COM LLC. Keeping the gun pointed in a safe direction-preferably muzzle up, hold the gun by the handguard and the charging handle. May 7, 2017. "We will never sleep, 'cause sleep is for the weak. What BCG? What else could it be? Is this a complete lower (hammer, trigger installed)? Me being relatively new to the AK, but not new to disassembly/reassembly of mechanical things, I can tell you don't force anything. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. I've had the same situation happen to me once before and it turned out that the round had a slight bulge around it's base. Before replacing the upper, do one more test--swap both the charging handles and the BCGs of the rifles. About Us Policies Reviews How To. I have to tap it on the ground to get the buffer spring to push the . I'm assuming the problem is the BCG, but I don't get why it works on my nice ar but not on the cheapo ar. If done correctly it will not damage the rifle and is a much safer way to get a stubborn round out. Does a normal at carrier work good in it. Full . Now press the forward assist to make sure the bolt is locked up. I always disassemble new BCG's, clean and over oil, then sit in front of the tv for an hour or so and manually rotate, push and pull on the bolt in the carrier over and over until the movement is smooth and without any rough spots. Also the charging handle lever, rails, and CH race in the upper. What you are going to have to do is "mortar" it. They also drilled the gas port out a little larger since I am using a low mass carrier and adjustable gas block. I hadn't done much of anything since the previous day except to slide the bcg in and out of the chamber about twenty or thirty times really quickly to make sure they were moving and functioning fine. Remember ARs like it very wet to function well. The 9MM AR platform requires some specialized rifle parts to function reliably and prolong longevity of the hardware. You can leave almost the entire thing dry, as most of it doesn't touch anything. How the bolt carrier group works In a normal AR-15 (note, not an AR-9) is when you fire a round, the gas will be redirected from the spent cartridge from the . Do a function check. It may not display this or other websites correctly. $157.49. 158; HP/MPI Inspected bolt Answer (1 of 8): Is an AR-15 .300 AAC Blackout bolt carrier group the same as a .223/5.56 BCG? Create an account to follow your favorite communities and start taking part in conversations. I dabbed a tiny bit of clp around the bolt, inside the carrier, where the rings are. It will chamber a round alright, but takes a great amount of force to pull it back manually. Now if you look at the 9mm buffer specifications below you will notice that most 9mm AR buffers are longer than the Colt or RRA which are the traditional standards. The purpose of this page is to aid you with 9MM AR troubleshooting. Ok, I am a total noobie. Perhaps a tad catawampus or debris. November 14, 2010 in The Beginners AR15 Armory. 2. Are you sure it's the bolt binding, and it's not bound on the gas tube? Yes. Expand. By Faxon 5.56/300 BLK Gunner Light Weight Bolt Carrier Group Nitride M16 Bolt Carrier Group AR15 BCG. Maybe there is/was a bur in the barrel at the gas port . It is surprising sometimes how stiff a new BCG can be. When firing the bolt will get stuck in the chamber, in order to eject the casing I will have to grab the charging handle and bump the buttstock to dislodge it . AR-308 Accuracy problems. The BCG will get stuck half way through the buffer tube and sometimes all the way in the buffer tube. Press J to jump to the feed. Also it caused other issues, like the bolt over-running the bolt catch on the last round. Get rid of fancy BCG sand use a standard one. EDIT: FIXED! This wouldn't be the first time I'm wrong but if possible try running your stick with a standard mil-spec/phosphate finish BCG and see what happens bro. As others stated, give it a good cleaning and lube well to include lugs and barrel extension. Issue is that bolt won't rotate/slide back inside bolt carrier. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Put your pins back in and smack the buttstock on the ground. A similar incident happened at the range last week and the guy had some debris stuck in the locking lugs. The case wound up being stuck in the chamber (it didn't burst or anything, but was stuck in there pretty good). Press J to jump to the feed. Next. If you recoil spring feels week replace it with a Wolff XP or from another reputable manufacturer. 6.5 Type II Grendel Nitride Bolt Assembly $ 99.95 $ 69.95 SALE. Assuming that your upper is still attached to your lower start by making sure your bolt is in battery and then push the rear pin (called the takedown pin) till it clicks and is held captive on the right side of the receiver. I would double check this. 1,592. Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: on the back side of the bolt (not the bcg), on the rounded/sloped part just behind the two c-rings where there's often a good amount of caked carbon on well used bolts, there was a solid deposit of fouling and copper. "Rack" pull the charging handle of your AR-15 back swiftly with ample force and release it . The mass & inertia of the bolt carrier group will pop the stuck round out of the chamber. At most, I shot three three-shot groups in two minutes. "Tap" your magazine to be sure it is properly seated. Insert the firing retainer pin (aka cotter pin). The issue is the bolt won't move inside the BCG, and therefore won't go into battery . I'd have a close look at the chamber face. buffer tube), or threaded tail of the lower receiver where the receiver extension screws in. The Whisper was first based on the little .221 Fireball cartridge cas. Disassemble and clean/lube the sharps BCG. Take off the stock, loosen the castle nut, and unscrew the buffer tube. When the thickness of five stacked quarters .345 is added to the length of the Colt 9mm buffer we conclude our 9mm buffer needs to be approximately 3.645 long! Resetting the hammer in the lower receiver. Try this-put it back together. October 22, 2019 2:57 am Reply Gary. No AR15 build is complete without a high-grade Nickel Boron bolt carrier group - BCG . Charpy C-Notch. This should be enough thrust of inertia to get the bolt carrier assembly to come forward. Shop with us and get the best bolt carrier group on the market today! Rating: 93%. There may even be a live round in the chamber. Drop the firing pin in the opposite end of the bolt carrier, then press it down to ensure it seals properly. Which in turn fires the bullet. When you swap uppers, do you also swap bolt carriers? Its an Anderson Lower, Pre-assembled anderson upper, rear take down goes in like normal, and the BCG does go freely into the upper. Before you do any removing of anything, or hacksawing please do the following. So far the drum stuff hasnt been that bad, course having Mike around to post updates & videos helped a ton. Here is a video on how to do it. I bashed the forward assist, but bolt is seized hard. See if there's any damage to the 45 degree relief cuts. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Yes. It seems there is a ridge in the inner channel and if the bolt is pushed too deep into the carrier, the gas rings stick on that channel. AR 10 Charging Handles Review. Platform: AR-10. . All Rights Reserved. View Details Aero Precision AR-15 PRO Series Bolt Carrier Group (BCG) - Black Nitride . $98.99. Search. Was in a hurry putting my MPX back together after cleaning and put the bolt carrier group into the upper receiver backwards. Check out our deals on our bolt carrier groups to complete an AR upper or to find a spare part. At this point in my life, I had thought that I had learned to always inspect new equipment before trying to use it. Note: When discussing the 9MM AR the assumption is made that the shooter is utilizing a carbine length buffer system. Instagram Facebook-f Youtube. Here I will give a brief breakdown of the BCG's components, how it works, problems to look for and what to consider when buying. Reason Two The blow back nature of the 9MM AR recoil system provides the 9MM bolt with some serious energy and velocity. All Rights Reserved. (I had my M&P15 do this occasionally when using steel case ammo I never could figure out what it was about the steel cased ammo that was causing the problem) Have you tried to manually run some rounds thru it with a full magizine to see if any get stuck? When the bullet passes by the gas port , the bur shaves a little off the bullet and the gasses send it down the gas tube back into the BCG . [ARCHIVED THREAD] - Bolt carrier stuck in buffer tube. CMMG and Rock River Arms also offer 9MM AR specific bolt catches. SALE PRICE: $139.99. Y en este artculo te lo ensearemos a cmo hacerlo. Its always nice to exclude thing as being the problem . The general consensus is brute force. I can take out the pins and the upper an lower come apart a bit, but I can't completely remove them. Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. "After attempting this a few times I called another guy at the range over and we pulled from two ends of the gun, me from the barrel and him from the charging handle.". If the bolt carrier from the problem rifle binds in the non-problem rifle, the bolt carrier from the problem rifle might actually be the problem. Caliber / Gauge: .308 / 6.5 Creedmoor / .243 Winchester / .22-250. The BCG moves freely already. Put the gun back together. The BCG will also ensure proper lock up when the rifle is fully into battery so you do not want to cut corners here. There might still be a problem with the problem rifle's lower receiver extension (a.k.a. On my new rifle, I've been having an issue where the bolt carrier tends to get "stuck" or locks back. Bash on the forward assist? On select areas, especially during warm weather, I prefer grease though if in a sandy environment I'd stick with oil. I did it last weekend. Redirects gas produced from firing to perform other functions. AT3 AR-15 Bolt Carrier Group - 5.56 NATO/.300 Blackout - Nickel Boron. 16" 5.56 / .223 1x7 GOVERNMENT 4150 CrMoV MELONITE NITRIDE BARREL - MID-LENGTH GAS. B2-K630-BA00. Perhaps at least a little between the carrier and bolt, as well as a tiny bit in the star chamber near the lugs will help, at least until the rifle settles in a bit. ? This unfortunately allows the 9MM bolt to travel further down the buffer tube than necessary. If the BCG is that far back it shouldn't be too hung up. Shop CMC Triggers Enhanced AR Bolt Carrier Group | Up to 10% Off 4.3 Star Rating on 6 Reviews for CMC Triggers Enhanced AR Bolt Carrier Group Best Rated + Free Shipping over $49. Take it apart and clean it real good then oil it back up and cycle it several times. COMPANY. Bet-your-life dependability is a non-negotiable prerequisite. Out of stock. Jones. But there are A LOT of choices. Some thrifty and clever shooters have added spacers, five stacked quarters etc in their buttstock, added weights to their buffers and made modifications to the buffer to increase its overall length and weight. The bolt should be centered properly. thanks for your reply. . Flat Dark Earth m16 FDE pvd ar15 bolt carrier group BCG $ 248.80 $ 199.80-43%. The Lower Parts Kit for AM-15 includes the following: Bolt Catch . If the problem still occurs in the problem rifle, then those two components are not contributing to the problem and the issue is the alignment of the upper to the lower receiver extension. Does the round at all look deformed? Re your edit - ha! Reason One A 9MM AR Bolt is shorter than a milspec AR-15 Bolt Carrier Group. Solution Part One The Colt 9mm buffer is 3.300 long. It is comprised of the bolt, carrier, extractor, ejector, gas key, gas rings, cam pin, firing [in, and the firing pin retaining pin. Odin Works AR-15 6.5 Grendel Black Nitride Type 2 Bolt Carrier Group Usually Ships in 24 Hours MSRP: $149.00 . According to my brother, our Vietnam veteran, "mortaring" was unofficially adopted during fire fights when someone was shooting at you and your life was on the line. This is odd. Grabbing onto a new round from the magazine and chambering it. If there is no problem in the non-problem rifle and the problem rifle continues to have the binding issue, this leaves the problem rifle's upper as the problem. Concrete and rebar 12in thick ceiling, walls and floor. In my opinion this is less than ideal.