Bcm lower mk2.

CONTACT Bravo Company MFG, Inc. PO Box 361 Hartland WI, 53029 E [email protected] Employee Owned P (877) 272-8626 (BravoCo) F (262) 367-0989

Bcm lower mk2. Things To Know About Bcm lower mk2.

bcm 12.5" upper receiver group qrf-10 no charging handle bcm mk2 14.5 mid length complete upper with fde mcmr-13 bcm bfh 14.5" mid length upper receiver group no charging handle bcm 11.5" enhanced lightweight carbine upper receiver w mcmr handguard no charging handle BCM Complete MK2 Lower Receiver Group with BCM MOD 0 Stock (FDE) Machined from Aluminum Forgings 7075-T6; Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2; BCM Milspec 7075-T6 Receiver Extention; Staked M4 Lock Nut; USGI H Buffer (1 USGI Tungsten, 2 Steel) BCM Trigger Guard; BCM PNT Trigger; BCM Gunfighter's Grip, Mod 3; Low Shelf for RDIAS ... 16in. Barrel Style: BFH. Handguard: MCMR-15. Upper Receiver: MK2. BCM® Bolt Carrier Group: None BCM® Bolt Carrier Group (MPI) (Auto) (included FREE w/ Upper Receiver Group, Special Limited Time Offer) BCM® Charging Handle: None Ambi MK2 Handle (LARGE) +$89.95 Ambi MK2 Handle (MEDIUM) +$89.95 Asym MK2 Handle (LARGE) +$74.95 Asym MK2 Handle ...Key Features VFC AR Series GBBR Improved Lower Receiver Internal Structure & New Firing Pin Design AR Redesign of the internal groove of the AR series GBBR lower receiver. The number of parts of the firing pin parts is less than that of the old version, and it is easier to maintain. ... SKU: VFC-BCM-MK2-2T-145 VFC BCM MK2 MCMR 14.5" V3 Two Tone ...

718008643. UPC. 812526023759. Manufacturer. Bravo Company. Lower Receiver Group w/ MK2 Receiver Extension & Stock Mod 1 SOPMOD. Black - Utilizes the BCM MK2 Receiver Extension, MK2 buffer, and rifle M16 action spring. The MK2 receiver extension is approximately 3/4'' longer than the standard 6-position extension. Cartridge: 5.56 mm …The BCM AR-15 Complete Lower Receiver is forged and machined from 7075-T6 Aluminum. The receivers are Hardcoat Anodized per MIL-A-8625F, Type III, Class 2 specifications. Features a Staked M4 Lock Nut, …Shit will run hard, it's affordable, it's in stock. BCM is the best bang for buck. URGI is great, but more money for not that much more value. DD rIII is badass too, but costs a lot for what you get. Also, I don't care for the short handguard on the 14.5. Can't make a bad decision, just a matter of preference and budget.

Additionally, the tolerances in general are "looser" that other lower receivers I have. My personal recommendation would be to get a complete BCM lower with their Mk2 recoil system if you can save up a bit more. Or, the best-fitting lower I have is a Centurion. Aero is usually OK, but haven't been perfect for me.Zeroed quickly shoots accurately not a ton of recoil with standard a2 hider. If any complaints would be that it spits pretty decent fireballs but that’s to be expected with a short barrel. Next. BCM® MK2 11.5" carbine upper receiver group. This AR15 upper comes with a 11.5in barrel, a 10in MLOK handguard (MCMR-10), & your choice of muzzle ...

BCM® Mk 12 Complete Upper Receiver Group Mod 0-Bravo (PRI Black) BCM. MSRP: $1,670.00 Your Price: $1,506.40 (You save $ ... cover with my thumb. I can't wait to see what this upper will do with better weather and a lighter trigger in my lower. Kudos to BCM for such a fine product! Related Products; Quick view Choose …Perfect for my lower made by Springfield Amory (Saint). Great upgrade. 5 Excellent Upper. Posted by Frank L on Aug 22nd 2018 ... BCM. BCM® MK2 SS410 18" Rifle Complete Upper Receiver Group w/ KMR-A15 Handguard 1/8 Twist. MSRP: $1,067.99 Your Price: $855.99. Out Of Stock. Quick view Out of stock. BCM.Description. Lower Receivers W/ MK 2 RMS & Mod-0 Stock. BCM Lower Group w/MK2RMS-M1T0 & BCMGUNFIGHTER Stock Mod-0-Flat Dark Earth - Utilizes the BCM MK2 Receiver Extension, MK2 buffer, and rifle M16 action spring. The MK2 receiver extension is approximately 3/4'' longer than the standard 6-position receiver extension.About the BCM® Mk 12 Complete Upper Receiver, Mod 4X-Bravo (KMR-A15) Features included in basic price: BCM® KMR Alpha 15" BCM® SS410 18" Stainless Barrel, Ionbond Black DLC; Rifle Length Gas System; Pinned Low Profile Gas Block; BCM® Bolt Carrier Group (HPT/MPI), autoBCM® Mk 12 Complete Upper Receiver Group Mod 0-Bravo (PRI Black) BCM. MSRP: $1,670.00 Your Price: $1,506.40 (You save $ ... cover with my thumb. I can't wait to see what this upper will do with better weather and a lighter trigger in my lower. Kudos to BCM for such a fine product! Related Products; Quick view Choose …

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Description. Lower Receivers W/ MK 2 RMS & Mod-0 Stock. BCM Lower Group w/MK2RMS-M1T0 & BCMGUNFIGHTER Stock Mod-0-Flat Dark Earth - Utilizes the …

CONTACT Bravo Company MFG, Inc. PO Box 361 Hartland WI, 53029 E [email protected] Employee Owned P (877) 272-8626 (BravoCo) F (262) 367-0989If you've found yourself in the AR market for the first time and don't mind spending a little bit more for a rifle that's firmly a few steps above entry-level, we have a feeling you're going to be pretty stoked on the BCM Recce-16 AR-15. BCM Recce-16 MCMR AR-15. $1,559. at Brownells. Prices accurate at time of writing.BCM ® LOWER RECEIVER. Receiver Machined from Aluminum Forgings 7075-T6, Hardcoat Anodized (per MIL-A-8625F, Type III, Class 2) Low Shelf for RDIAS Installation - Installation of a registered drop-in auto sear allows weapon to fire on full automatic. Low Shelf for Accuwedge use. Fire Controls Marked SAFE and SEMI. BCM ® Milspec 7075-T6 ...Shop BCM® AR-15 upper receiver parts including our upper receiver assembly, forward assist assembly and ejection port cover assembly. We carry other AR-15 parts including barrels, suppressors, flash hiders, compensators, sights, gas blocks, gas tubes, charging handles, bolt carrier components and more. If you would like to shop complete AR ...Description. Redesigned by lessons learned in combat since 9/11, the BCM MK2 Upper Receiver is built with up to 30% more rigidity than the current Mil-Spec M4 upper receiver without sacrificing interoperability for a mere additional 1/3 ounce of weight. Upper receivers with baked in carry-handles and iron sights have been relegated to history.

MK 2 RECEIVER OPTIMIZED The U.S. patents pending BCM Mod 3 Charging Handle now features upper and lower and side exhaust channels to vent gas from the chamber away from the shooter during operation of the weapon. While these channels are optimized for the BCM MK2 Upper receiver, they still provide improved gas diversion on all Mil-Spec …BCM® Enhanced Lower Parts Kit for your AR15 Lower Receiver. This kit includes all the Mil-Spec quality components you have come to expect from BCM, along with some fantastic upgrades to include; BCM PNT Trigger Assembly. BCM Pistol Grip, Mod 3. BCM Enhanced Trigger Guard. In a commercial market flooded with imported …The BCM® MK2 Ambi Large charging handle (5.56/.223) latches extend past the main body of the charging handle by approximately 1.14 in. ... MK 2 RECEIVER OPTIMIZED The U.S. patents pending BCM Mod 3 Charging Handle now features upper and lower and side exhaust channels to vent gas from the chamber away from the shooter during operation of the ...Oct 8, 2021 · BFH. Handguard: MCMR-15. Barrel Profile: Enhanced Light-Weight. BCM® Bolt Carrier Group: None BCM® Bolt Carrier Group (MPI) (Auto) (included FREE w/ Upper Receiver Group, Special Limited Time Offer) BCM® Charging Handle: None Ambi MK2 Handle (LARGE) +$89.95 Ambi MK2 Handle (MEDIUM) +$89.95 Asym MK2 Handle (LARGE) +$74.95 Asym MK2 Handle ... BCM Lower Group w/MK2RMS-M1T0 & BCMGUNFIGHTER Stock Mod-0-SOPMOD (Wide-body) - Flat Dark Earth - Utilizes the BCM MK2 Receiver Extension, MK2 buffer, and rifle M16 action spring. The MK2 receiver extension is approximately 3/4'' longer than the standard 6 position extension.Handguard: MCMR-13. Barrel Profile: Enhanced Light-Weight. BCM® Bolt Carrier Group: None BCM® Bolt Carrier Group (MPI) (Auto) (included FREE w/ Upper Receiver Group, Special Limited Time Offer) BCM® Charging Handle: None Ambi MK2 Handle (LARGE) +$89.95 Ambi MK2 Handle (MEDIUM) +$89.95 Asym MK2 Handle …The BCM AR-15 Complete Lower Receiver is forged and machined from 7075-T6 Aluminum. The receivers are Hardcoat Anodized per MIL-A-8625F, Type III, Class 2 specifications. Features a Staked M4 Lock Nut, USGI H Buffer (1 USGI Tungsten, 2 Steel), Low Shelf for RDIAS installation, and Low Self for Accuwedge use. Fire Controls are marked Safe and Semi.

AR-15 Lower Parts . All AR-15 Lower Parts; AR15 Lower Parts Kits; Tactical Triggers; Trigger Guards; AR15 Misc Lower Parts; Stocks and Grips . All Stocks and Grips; Stocks . ... BCM. BCM® MK2 Standard 14.5" Mid Length (Enhanced MEDIUM Weight-*FLUTED*) Complete Upper Receiver Group w/ KMR-A13 Handguard. MSRP: $1,017.39

12.5in. Barrel Style: Standard. Handguard: MCMR-10. Upper Receiver: MK2. BCM® Bolt Carrier Group: None BCM® Bolt Carrier Group (MPI) (Auto) (included FREE w/ Upper Receiver Group, Special Limited Time Offer) BCM® Charging Handle: None Ambi MK2 Handle (LARGE) +$89.95 Ambi MK2 Handle (MEDIUM) +$89.95 Asym MK2 Handle (LARGE) +$74.95 Asym MK2 ...Bravo Company USA AR-15 Complete Lowers, BCM Uppers, and a full list of BCM Gunfighter accessories including the MCMR handguard for sale at Primary Arms. ... Bravo Company Manufacturing Mk2 Recoil Mitigation System - Mod 1 - T1. View Details. $116.95 ... Bravo Company Manufacturing BCMGUNFIGHTER AR-15 Enhanced Lower Parts Kit - Black. View ...The U.S. patents pending BCM Mod 3 Charging Handle now features upper and lower and side exhaust channels to vent gas from the chamber away from the shooter during operation of the weapon. While these channels are optimized for the BCM MK2 Upper receiver, they still provide improved gas diversion on all Mil-Spec upper receivers. LIFE SAVING TOOLS.BCM MK2 14.5 BFH ELW MCMR 13 MLOK W/ A2 FH (NFA) Redesigned by lessons learned in combat since 9/11, the BCM MK2 Upper Receiver is built with up to 30% more rigidity than the current Mil-Spec M4 upper receiver without sacrificing interoperability for a mere additional 1/3 ounce of weight. Can anyone confirm if a BCM MK2 BFH upper can fit with LWRC M6IC lower? I think I’ve found pics of this setup online but I’ve also read a thread here saying that there may be some fitment issues. Any insight from someone who may be running this setup would be really appreciated. Edit: we have confirmed that this pair will not fit together ... Sniper's Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Founded by Frank Galli in 2000, Sniper's Hide has been offering informational videos, podcasts, and other support to its users in one location. Forum Statistics. Threads. 473,232.BCM Lower MK2 W/SOPMOD Stock Description: Guns Listing ID: 627798 This is a BRAND NEW BCM AR15 Lower. Comes with everything shown in the pic (GF MOD3 Grip, BCM PNT FCG, BCM‚‚s QD plate & BCM SOPMOD Stock). This lowers feature their new MK2 Recoil Mitigation System. We are an authorized BCM Distributor so buy with confidence!The U.S. patents pending BCM Mod 3 Charging Handle now features upper and lower and side exhaust channels to vent gas from the chamber away from the shooter during operation of the weapon. While these channels are optimized for the BCM MK2 Upper receiver, they still provide improved gas diversion on all Mil-Spec upper receivers.BCM Lower with Gunfighter MOD-2 SOPMOD Stock. Your Price: $395.00 Out of Stock. BCM Pistol Lower W/SBA3. Your Price: $475.00 Out of Stock. ... BCM Lower W/ MK2 Recoil Mitigation System Mod 1 - T0. Your Price: $403.00 Out of Stock. More results: 1 2 3 Next Page View All. Gift Certificates; Terms and Conditions;Their BCM MK2 Receiver Extension for your AR15, M16, M4. Machined from 7075T6 and manufactured to Mil-Spec dimensions and specifications. Mil-Spec receiver extensions have a slightly smaller dimension where the stock slides on. Hard Coat Anodized per Mil-A-8625F, Type III, Class 2.

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Depends on what the right side bolt release looks like, the forward assist on the Mk2 uppers is further forward, so if the paddle for the bolt release sticks up you’ll have clearance issues. I don’t have any firsthand experience with a PWS lower, but I do have a Mk2 on a Radian ambi lower with no fitment issues. It’s completely flush with ...

Handguard: MCMR-13. Barrel Profile: Enhanced Light-Weight. BCM® Bolt Carrier Group: None BCM® Bolt Carrier Group (MPI) (Auto) (included FREE w/ Upper Receiver Group, Special Limited Time Offer) BCM® Charging Handle: None Ambi MK2 Handle (LARGE) +$89.95 Ambi MK2 Handle (MEDIUM) +$89.95 Asym MK2 Handle …The U.S. patents pending BCM Mod 3 Charging Handle now features upper and lower and side exhaust channels to vent gas from the chamber away from the shooter during operation of the weapon. While these channels are optimized for the BCM MK2 Upper receiver, they still provide improved gas diversion on all Mil-Spec upper receivers. LIFESAVING TOOLSHand made by Americans in Hartland, WI - the BCM Mod 2 stock is an improvement over the baseline M4 accessory with enhanced ergonomics, and next-level durability. Recontoured into a patented (United States Patent Number: D901616) semi-clubfoot design, the Mod 2 is fits on Mil-Spec carbine receiver extensions, and optimized for intermediate length receiver extensions (MK2, AR10, A5).Zeroed quickly shoots accurately not a ton of recoil with standard a2 hider. If any complaints would be that it spits pretty decent fireballs but that’s to be expected with a short barrel. Next. BCM® MK2 11.5" carbine upper receiver group. This AR15 upper comes with a 11.5in barrel, a 10in MLOK handguard (MCMR-10), & your choice of muzzle ...BCM® MK2 Upper Receiver Assembly (w/ Laser T-Markings) BCM MK2 UPPER RECEIVER Redesigned by lessons learned in combat since 9/11, the BCM MK2 Upper Receiver is built with up to 30% more rigidity than the current Mil-Spec M4 upper receiver without sacrificing interoperability for a mere additional 1/3 ounce of weight. MEET THE NEW WAR SAME AS THE OLD WAR Upper receivers with baked in carry ...If you use Apple's Notes app, you can lock sensitive photos, videos, documents, and more. Searching for data or photo lockers will lead you to many apps. Some of them are genuinely...BCM Lower Group w/MK2RMS-M1T0 & BCMGUNFIGHTER Stock Mod-0-SOPMOD (Wide-body) - Flat Dark Earth - Utilizes the BCM MK2 Receiver Extension, MK2 buffer, and rifle M16 action spring. The MK2 receiver extension is approximately 3/4'' longer than the standard 6 position extension.ADAC-15. Lower Receiver. $514.95. Color. Add to Cart. Shipping Lead Time 2-3 weeks (FFL required to ship) Machined from billet 7075-T6 aluminum, the A-DAC 15 is a fully ambidextrous lower receiver for AR15-style firearms. In addition to the Talon Ambidextrous Safety Selector, left-side magazine release, and right-side bolt release, the A-DAC 15 ...Upgrade your next build with the full-ambi MK2 lower receiver for a superior rifle foundation. Lower Receiver Manual ... aside, I really like the trigger guard, specifically the straight portion to the rear, as it allows the shelf on the BCM pistol grip I'd decided on using. One thing I'd like to see is the use of pictograms instead ...And I think that this feature, more than the extra receiver strength or the gas expansion chamber, is probably the most tangible benefit of the BCM MK2 upper for the average AR-15 buyer (assuming that they don't choose to run a lefty rifle instead, like the ones made by Stag). Posted: 1/2/2020 6:05:27 PM EDT.Shop BCM® AR-15 upper receiver parts including our upper receiver assembly, forward assist assembly and ejection port cover assembly. We carry other AR-15 parts including barrels, suppressors, flash hiders, compensators, sights, gas blocks, gas tubes, charging handles, bolt carrier components and more. If you would like to shop complete AR ...

The BCM Mod 3 AR15 pistol grip gives you improved ergonomics, a wider grip than Mod 0 or Mod 1, water-resistant storage inside the grip, and more. ... BCM® MK2 Upper Receiver Groups; Cosmetic Blem Upper Groups; 20" Rifle Upper Group; 18" SPR Mk 12 Upper Half; ... AR-15 Lower Parts. Gunfighting Links American Gunfighter Films Gunfighters. BCM ... BCM Complete MK2 Lower Receiver Group with BCM MOD 0 Stock (FDE) Machined from Aluminum Forgings 7075-T6; Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2; BCM Milspec 7075-T6 Receiver Extention; Staked M4 Lock Nut; USGI H Buffer (1 USGI Tungsten, 2 Steel) BCM Trigger Guard; BCM PNT Trigger; BCM Gunfighter's Grip, Mod 3; Low Shelf for RDIAS ... BCM ® LOWER RECEIVER. Receiver Machined from Aluminum Forgings 7075-T6, Hardcoat Anodized (per MIL-A-8625F, Type III, Class 2) Low Shelf for RDIAS Installation - Installation of a registered drop-in auto sear allows weapon to fire on full automatic. Low Shelf for Accuwedge use. Fire Controls Marked SAFE and SEMI. BCM ® Milspec 7075-T6 ...Instagram:https://instagram. lincoln parish obituaries Details. Building a top-of-the-line rifle just got easier with the Primary Weapons Systems MK1 Mod 2-M Complete AR-15 Lower Receiver with BCM Furniture. This fully ambidextrous MK1 Mod 2-M complete lower is the quality base you've been looking for for your next build. While most receivers are custom milled from billet aluminum for weight ... lucas oil eras tour seating chart Description. Customer Reviews. Questions and Answers. BCM MK2 14.5 BFH ELW MCMR 13 MLOK Pinned BCM MOD on 3 COMP. 16" OAL. Features: BCM MK2 UPPER RECEIVER. Redesigned by lessons learned in combat since 9/11, the BCM MK2 Upper Receiver is built with up to 30% more rigidity than the current Mil-Spec M4 upper receiver without sacrificing ... obituaries in duluth mn 16in. Barrel Style: Standard. Handguard: MCMR-15. BCM® Bolt Carrier Group: None BCM® Bolt Carrier Group (MPI) (Auto) (included FREE w/ Upper Receiver Group, Special Limited Time Offer) BCM® Charging Handle: None Ambi MK2 Handle (LARGE) +$89.95 Ambi MK2 Handle (MEDIUM) +$89.95 Asym MK2 Handle (LARGE) +$74.95 Asym MK2 Handle (MEDIUM) +$74.95 ...AR-15 Misc Lower Parts. Read More expand_more Read Less expand_less Sort By: Quick view Add to Cart. BCM *Cosmetic Blem* BCM® MK2 Receiver Extension ... BCM. BCM MK2 Recoil Mitigation System - Mod 1 - T2. MSRP: $138.00 Your Price: $123.95. Out Of Stock. Quick view Add to Cart. Carbine Buffer. $11.00. amy robach daughters If you’ve found yourself in the AR market for the first time and don’t mind spending a little bit more for a rifle that’s firmly a few steps above entry-level, we have a feeling you’re going to be pretty stoked on the BCM Recce-16 AR-15. BCM Recce-16 MCMR AR-15. $1,559. at Brownells. Prices accurate at time of writing.Also the bolt catch pin can be annoying sometimes, that can be made easier if you go with an AERO M4E1 lower with the bolt catch screw. Everything else is SUPER easy. Build off an M4E1 lower, they’re my go to. Get the $6 punch … henrico county salary Areo lower, bcm 12.5 mk2 upper, geissele trigger, cmc lower parts kit, radian ambi charging handle, radian ambi safety, Ip1 site, SBA3 stock, Trex arms sling. (I know black camo isn't cool but I like it so fuck you. Respectfully of course). A little over $1,100 build not including the site and with some Black Friday shopping and coupon codes.BCM MK2 RECCE-14 BFH ELW MCMR-13 MLOK W/Pinned Surefire Warcomp (Open Tine) Your Price: $1,899.00 Out of Stock. BCM MK12 MOD 0 Black. Your Price: $2,814.00 ... BCM Lower with Gunfighter MOD-2 SOPMOD Stock. Your Price: $395.00 Out of Stock. BCM RECCE-16 MK2 BFH ELW MCMR-15 MK2RMS SOPMOD 2. Your Price: $1,767.00 touchstar cinemas sabal palms deals The BCM AR-15 Complete Lower Receiver is forged and machined from 7075-T6 Aluminum. The receivers are Hardcoat Anodized per MIL-A-8625F, Type III, Class 2 … delta airlines 2077 BCM Complete MK2 Lower Receiver Group with BCM MOD 0 Stock (FDE) Machined from Aluminum Forgings 7075-T6; Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2; BCM Milspec 7075-T6 Receiver Extention; Staked M4 Lock Nut; USGI H Buffer (1 USGI Tungsten, 2 Steel) BCM Trigger Guard; BCM PNT Trigger; BCM Gunfighter's Grip, Mod 3; Low Shelf for RDIAS ... A widebody design, the BCMGUNFIGHTER™ Stock Mod-0 SOPMOD has a more pronounced cheekweld which can assist in accuracy and comfort and is available in your choice of Black or Flat Dark Earth. Machined from 7075-T6 aluminum forgings with a Mil-Spec hard coat anodized finish, the lower receiver is completed with the BCM® small parts that keep ...Redesigned by lessons learned in combat since 9/11, the BCM MK2 Upper Receiver is built with up to 30% more rigidity than the current Mil-Spec M4 upper receiver without sacrificing interoperability for a mere additional … drainwig shark tank net worth Shop a large selection of in stock Bravo Company Lower Receivers manufactured by Bravo Company (BCM). Get 50% off now - Click Here FAST, FREE shipping on Ammo, Parts, … main event brownsville reviews I'm going to swap my 16" BCM BHF ELW standard upper for a similar 14.5" upper. Is it worth waiting for the ones with the MK2 uppers to surface? Are the MK2 …BCM® MK2 Upper Receiver Groups; Cosmetic Blem Upper Groups; 20" Rifle Upper Group; 18" SPR Mk 12 Upper Half; 18" Rifle Upper Group; 16" M4 Carbine Upper Group; ... BCM. BCM Lower 1/3 Cowitness A/T Optic Mount for AIMPOINT MICRO T2. MSRP: $140.00 Your Price: $119.00. In Stock. Quick view Add to Cart. BCM. horse and buggy riders in the pennsylvania countryside For the AR budget builder or anyone who wants to perform a top-of-the-line upgrade to their existing AR, this complete BCM4 lower receiver group from Bravo Company Manufacturing with FDE Gunfighter Mod O Stock represents the pinnacle of affordable upgrades you can make. Features: Material: 7075 T6 Aluminum. Caliber: 5.56 NATO/223 Remington.But that 81% stripped lower is a firearm…. I came here to say I am doing the exact same, SBRing a PSA lower with a BCM upper! I did this but with my Anderson lower. Lol I put an 11.5 ELW fluted BCM on a special BCM lower made by FN and SBR'd it. DNGAF, would do again. Whatever, elite. I put a BCM on a PSA lower! martin's import salvage BCM Lower Receiver Groups are built to the highest standards that includes BCMGUNFIGHTER upgrades like their new Mk2 Recoil Management System, PNT …And I think that this feature, more than the extra receiver strength or the gas expansion chamber, is probably the most tangible benefit of the BCM MK2 upper for the average AR-15 buyer (assuming that they don't choose to run a lefty rifle instead, like the ones made by Stag). Posted: 1/2/2020 6:05:27 PM EDT.