Best lower receiver for bcm upper.

Aero m4e1 lower. Bcm upper. Can’t go wrong. Best bang for your buck. Reply reply TH0TC0P • I second this, this is the exact setup I run and I couldn't ask for a better rifle. Reply reply FlyFine • I third this, aero upper and lower receiver. Everything else is bcm ...How do the UK's two newest premium seats stack up? Just a few weeks apart, both major UK-based airlines have gone from having dated, subpar premium-cabin offerings to launching two... 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11.5" Carbine Upper Group; 7", 9" Pistol Upper Group; BCM® 300 BLACKOUT Upper Receiver Groups; BCM® Upper Groups with KMR™ (KeyMod™) Handguards; BCM® Upper Groups with (M-LOK®) MCMR Handguards; BCM® Upper Groups with QRF™ (Quad Rail Forend) BCM ... BCM® BFH 16" Mid Length (ENHANCED Light Weight) Complete Upper Receiver Group w/ MCMR-15 Handguard. MSRP: $1,053.95. Your Price: $830.95. In Stock. BCM® MK2 BFH 14.5" Mid Length (ENHANCED Light Weight) Complete Upper Receiver Group w/ MCMR-13 Handguard. MSRP: $1,117.55. Your Price: $844.99. In Stock.Best Ambidextrous AR-15 Lowers. 1. Seekins Precision SP223 Gen 2 Billet Ambi Lower. Seekins Precision is well known for their high-end AR parts, and their SP223 ambi lower is no exception. For starters, the lower is machined from a solid block of 7075-T6 aluminum. A Seekins SP223 lower in burnt bronze.

18 Inch SPR Mk12 Upper Half. BCM SPR Mk12 Upper Group Features. 18" BCM SS410™ Barrel. Rifle Length Gas System. Taper Pinned Low Profile Gas Block or Fold Front Sight Base. Rifle Length Handguards or Extended Rifle Length Handguards. BCM BCG with fitted HPT/MPI Bolt. Choice of Charging Handle. Choice of Muzzle Device.Upper airway biopsy is surgery to remove a small piece of tissue from the nose, mouth, and throat area. The tissue will be examined under the microscope by a pathologist. Upper air...Latin is one of the most widely used writing systems in the world. It has evolved over centuries, and one of its key features is the distinction between lower case and upper case l...

16 Inch Recce AR-15 Upper Receiver Groups (Mid Length) SALE. Free Bolt Carrier Group with Purchase of Upper Receiver Group. (Limited Time Offer) Built in-house by U.S. Navy SEAL Team armorers, and later by the Naval Surface Warfare Center, Crane Division (often referred to as NSWC-Crane or "Crane"), the SEAL Recon Rifle was developed to provide ...Georgia-based Daniel Defense is a staple in the quality-built AR world and their upper game is on point, offering over 20 complete receivers in both .300 BLK and 5.56 NATO. The 4-bolt handguard mounting system is super stable, and the ambi "RIP N GRIP" charging handle is consistent and easy to use.

The latest research on Upper Respiratory Tract Infection Conditions. Expert analysis on potential benefits, dosage, side effects, and more. Upper Respiratory Tract Infection falls ...16 Inch Recce AR-15 Upper Receiver Groups (Mid Length) SALE. Free Bolt Carrier Group with Purchase of Upper Receiver Group. (Limited Time Offer) Built in-house by U.S. Navy SEAL Team armorers, and later by the Naval Surface Warfare Center, Crane Division (often referred to as NSWC-Crane or "Crane"), the SEAL Recon Rifle was developed to provide ...BCM® BFH 16" Mid Length (ENHANCED Light Weight) Complete Upper Receiver Group w/ MCMR-15 Handguard. MSRP: $1,053.95. Your Price: $830.95. In Stock. BCM® MK2 BFH 14.5" Mid Length (ENHANCED Light Weight) Complete Upper Receiver Group w/ MCMR-13 Handguard. MSRP: $1,117.55. Your Price: $844.99. In Stock.The Lung and Upper Aerodigestive Cancer Research Group conducts and supports research on the prevention and early detection of lung and head and neck cancers, as well as new approa...The upper receiver is the part that mates to the lower receiver, holds the charging handle, bolt carrier group ... Example of a monolithic upper receiver Best AR-15 Upper ... pinch or S-lock). Like the BCM upper, Hodge recommends thermal fitting for barrel extension installs. Hodge Defense Mil-Spec Upper Receiver. $160.00 at ...

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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 ...

BCM MK2 upper, looking for recommendations for ambi lower. Got a 14.5 BCM MK2 upper and am looking for a lower for it. I read LMT won’t work with them, am left handed so …14.5in. Barrel Style: BFH. Handguard: MCMR-13. 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 …Jan 2, 2020 ... BCM MK2 Upper Receiver ... Unboxing: BCM BCM® BFH 14.5" Mid Length Upper w/ MCMR-13 Handguard - Best Deal on the Interwebs? ... AR15 Lower Receivers ...Best AR-15 Stripped Receivers. 1. Aero Precision Stripped Upper Receiver. At $80, the Aero AR15 Stripped Upper Receiver is the gold standard in my mind. This option lets you choose your own forward assist and dust cover. It comes with M4 feed ramps, and laser engraved T-marks for the rails and is also available in several colors for a little ...Georgia-based Daniel Defense is a staple in the quality-built AR world and their upper game is on point, offering over 20 complete receivers in both .300 BLK and 5.56 NATO. The 4-bolt handguard mounting system is super stable, and the ambi "RIP N GRIP" charging handle is consistent and easy to use.All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ... Quick View. AR15 Upper Receiver Groups. BCM® MK2 SS410 18″ Rifle Upper Receiver Group w/ MCMR-15 Handguard 1/8 Twist. $ 979.99 $ 792.99. Sale! Quick View. AR15 Upper Receiver Groups. BCM® MK2 BFH 16″ Mid Length (ENHANCED Light Weight) Upper Receiver Group w/ KMR-A15 Handguard. $ 996.55 $ 792.99.

A body control module, or BCM, coordinates different operations within a car through the use of signals. Every electrical part of modern cars, from the door locks to the headlights...Phase 5 Tactical Forged Mil-Spec AR-15 Flat Top Upper Receiver. Price: $125.00. See Product Details. If you're looking for an AR-15 upper receiver that combines precision with strength, the Forged Mil-Spec AR-15 Flat Top Upper Receiver from Phase 5 Tactical is a major contender.Splenomegaly is a larger-than-normal spleen. The spleen is an organ in the upper left part of the belly. Splenomegaly is a larger-than-normal spleen. The spleen is an organ in the ... All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ... Aug 2, 2020 ... All Video Descriptions have been deleted as of 5/20/2021 My Odysee Channel has all the original content in the description there!Upper: BCM Mk2 16" BFH ELW upper Light setup: Modlite PLHv2 + Surefire DS00, SR07 Optic: T2 + G33 Lower: Radian AX556 ADAC Lower + Talon Trigger: Geissele SD3G Buffer setup: VLTOR A5 Stock: B5 SOPMOD Enhanced Misc: FCD Rail panel + FA, Geissele SCH, Emissary Handbrake, Surefire 3 prong Pistol: Glock 17 Trijicon RMR

14.5" URGI Loadout. For those not familiar, URGI stands for Upper Receiver Group Improved. The parts we used do not perfectly match what USASOC is using because we are not cloners. Still, we used very high-quality parts and trust that the rifle will perform to the same high standards as the issued rifles. The stock we picked is a B5 SOPMOD.DetailsComplete Bravo Company Manufacturing AR-15 lower receiver with BCM MK2 Recoil Mitigation System – Mod 1 – T0 and Mod 0 Gunfighter stock. The BCM MK2 Mod 1 – T0 recoil mitigation system is designed to lessen felt recoil without compromising reliability. To further enhance performance, this lower also features a Mil-Spec M16A4 rifle spring, …

Here are our picks for the best 300 Blackout Upper at every budget: Palmetto State 300 BLK Uppers - Best Budget Options. Aero Precision 300 BLK Uppers - Alternative Budget Options. BCM 300 BLK 9" MCMR-8 - Best for the Money. Radian Weapons Model 1 300 BLK - Best Overall. You can jump ahead to our picks by clicking here or continue reading.All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ...14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11.5" Carbine Upper Group; 7", 9" Pistol Upper Group; BCM® 300 BLACKOUT Upper Receiver Groups; BCM® Upper Groups with KMR™ (KeyMod™) Handguards; BCM® Upper Groups with (M-LOK®) MCMR Handguards; BCM® Upper Groups with QRF™ (Quad Rail Forend) BCM ...All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ...BCM ® Recce-16 MCMR ... EXTENDED LENGTH: {{eLength}} UPPER RECEIVER. Receiver Machined from Aluminum Forgings 7075-T6 and Hardcoat Anodized per MIL-A-8625F, Type III, Class 2. M4 Feed Ramp Flat Top with Laser T-markings. ... BCM ® LOWER RECEIVER. Receiver Machined from Aluminum Forgings 7075-T6, Hardcoat …300 BLK. Barrel Length: 9in. Barrel Style: Standard. Handguard: MCMR-8. BCM® Bolt Carrier Group: NoneBCM® Bolt Carrier Group (MPI) (Auto) (included FREE w/ Upper Receiver Group, Special Limited Time Offer) BCM® Charging Handle: NoneAmbi MK2 Handle (LARGE) +$89.95Ambi MK2 Handle (MEDIUM) +$89.95Asym MK2 Handle (LARGE) +$74.95Asym MK2 Handle ...Trijicon MRO-C-2200006: Trijicon MRO™ - 2.0 MOA Adjustable Red Dot with Lower 1/3 Co-Witness Mount $ 544.00; Aimpoint® ACO (Aimpoint Carbine ... BCM barrel components are parkerized separately before assembly. Prior to shipping, all BCM upper receiver groups are test fired for ... Best Selling. BCM® BFH 11.5" Carbine Upper Receiver … All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ...

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14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11.5" Carbine Upper Group; 7", 9" Pistol Upper Group; BCM® 300 BLACKOUT Upper Receiver Groups; BCM® Upper Groups with KMR™ (KeyMod™) Handguards; BCM® Upper Groups with (M-LOK®) MCMR Handguards; BCM® Upper Groups with QRF™ (Quad Rail Forend) BCM ...

Went the aero route as I refuse to pay $400+ for a BCM lower or $375 for a blem BCM lower (will snag one when I find one at a reasonable price) Snagged a compete magpul aero lower on sale, and have heard good things about the fit and finish!DetailsThe Bravo Company Manufacturing M4 Upper Receiver Assembly is professional grade weaponry. Precision machined to MIL-SPEC from a 7075-T6 aluminum forging provides this upper with exceptional strength. The inside diameter of the receivers threaded bore has been slightly undersized to provide a tighter fit with the barrel extension, …Dec 17, 2019 · The MK2 Upper Receiver also retains all USGI components in the assembly and works with all USGI bolt carriers, charging handles and barrel assemblies. Forged from 7075T6, the BCM MK2 Upper Receivers retain a form following grain structure which maximizes achievable strength. All of these improvements come without affecting the manual of arms ... 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.14.5in. Barrel Style: BFH. Handguard: MCMR-13. 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 … Bcm lowers are over priced and they use a third party parts. An aero is about 1/2 the price and equally well made. E: All the bcm fan boys downvoting even tho my go to gun has a bcm upper. Their shits good but it’s over priced. 15. Reply. obiwankanolie. • 3 yr. ago. I had a mk18 upper on an Aero m4e1 for a long time. The Upper East Side of New York City is known for its bustling streets, upscale shops, and world-class museums. However, finding parking in this busy neighborhood can often be a da...About the BCM® Standard 14.5" M4 (SOCOM) Complete Upper Receiver. The SOCOM M4 profile is a mid-weight profile barrel for the M4A1 Carbine. The flats milled under the handguards are for mounting of the M203. SOCOM requested the mid profile to better handle the volume of fire from their shooters. This profile is being adopted as a new standard ...DetailsThe Bravo Company Manufacturing M4 Upper Receiver Assembly is professional grade weaponry. Precision machined to MIL-SPEC from a 7075-T6 aluminum forging provides this upper with exceptional strength. The inside diameter of the receivers threaded bore has been slightly undersized to provide a tighter fit with the barrel extension, …14.5in. Barrel Style: BFH. Handguard: MCMR-13. 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 …Jan 17, 2014 ... Comments13 · AR15 Upper Receiver Visual Checks/Inspections · BCM complete lower · BCM Upper Problem - Oversized Lugs · My 2023 AR-15 Ti...Georgia-based Daniel Defense is a staple in the quality-built AR world and their upper game is on point, offering over 20 complete receivers in both .300 BLK and 5.56 NATO. The 4-bolt handguard mounting system is super stable, and the ambi "RIP N GRIP" charging handle is consistent and easy to use.

The popular BCM® Mod 4 Pistol Grip comes standard on the lower receiver. A BCMGUNFIGHTER™ Stock is available in your choice of Black and Flat Dark Earth on a Mil-Spec receiver extension which also includes a BCM® QD Endplate and staked castle nut. Machined Aluminum Forgings 7075 T6; Hardcoat Anodizing: MIL-A-8625F, Type III, Class 214.5in. Barrel Style: BFH. Handguard: MCMR-13. 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 …Upper airway biopsy is surgery to remove a small piece of tissue from the nose, mouth, and throat area. The tissue will be examined under the microscope by a pathologist. Upper air...All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ...Instagram:https://instagram. how much shock for 1500 gallon pool Sep 26, 2016 · Went the aero route as I refuse to pay $400+ for a BCM lower or $375 for a blem BCM lower (will snag one when I find one at a reasonable price) Snagged a compete magpul aero lower on sale, and have heard good things about the fit and finish! Best AR-10 Lowers. 1. Aero Precision M5 Lower. Aero Precision M5 .308 AR-10. I have made no secret that I love Aero Precision’s stuff. I’ve used their uppers, lowers, bolt carrier groups, and handguards extensively, and the only complaint I have is that I sliced my finger on a random staple on one of their packages once. bam wholesale coupon code 5.56 NATO. Barrel Length: 16in. Barrel Style: BFH. 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 …BCM® M4 Upper Receiver Assembly (w/ Laser T-Markings) Built to the correct Mil-Specs(Inside Diameter for barrel extension slightly undersized for a tighter fit to the barrel and a more accurate rifle. Please use a heat gun … signature nail spa of woodstock Sep 5, 2021 · 11.5in. Barrel Style: Standard. Handguard: MCMR-10. Barrel Profile: Government. 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 ... All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ... minnesota weather cameras Upper: BCM Mk2 16" BFH ELW upper Light setup: Modlite PLHv2 + Surefire DS00, SR07 Optic: T2 + G33 Lower: Radian AX556 ADAC Lower + Talon Trigger: Geissele SD3G Buffer setup: VLTOR A5 Stock: B5 SOPMOD Enhanced Misc: FCD Rail panel + FA, Geissele SCH, Emissary Handbrake, Surefire 3 prong Pistol: Glock 17 Trijicon RMR regal cinemas kailua BUILT TO EXCEED. Forged from 7075T6, the BCM MK2 Upper Receivers retain a form following grain structure which maximizes achievable strength, the MK2 Upper Receiver retains all USGI components in assembly and works with all USGI bolt carriers, charging handles and barrel assemblies. MADE IN AMERICA. All BCM components and … chandler mall restaurants To find the first quartile of a set of numbers, find the median of the lowest half of the data set. This median is the first, or lowest, quartile in the data set. To find the third...All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper … currency exchange palos hills BCM® MK2 Standard 16" 300 BLACKOUT Complete Upper Receiver Group w/ MCMR-15 Handguard. MSRP: $1,116.50. Your Price: $861.49.Best AR-15 Stripped Receivers. 1. Aero Precision Stripped Upper Receiver. At $80, the Aero AR15 Stripped Upper Receiver is the gold standard in my mind. This option lets you choose your own forward assist and dust cover. It comes with M4 feed ramps, and laser engraved T-marks for the rails and is also available in several colors for a little ...Got a 14.5 BCM MK2 upper and am looking for a lower for it. I read LMT won’t work with them, am left handed so ambi would be great. Thanks. I have an 11.5 BCM Mk2 on a Radian lower, highly recommend. I’ll look into those... maybe there’s stock. land for sale perry county indiana THE QUICK LIST. Mil-Spec Goodness. Aero Precision Stripped Upper Receiver. Jump to Details. Editor's Choice. Aero Precision M4E1 Stripped Upper … chevy 350 vacuum lines The Lung and Upper Aerodigestive Cancer Research Group conducts and supports research on the prevention and early detection of lung and head and neck cancers, as well as new approa...All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ... does benzonatate have acetaminophen in it DetailsThe Bravo Company Manufacturing M4 Upper Receiver Assembly is professional grade weaponry. Precision machined to MIL-SPEC from a 7075-T6 aluminum forging provides this upper with exceptional strength. The inside diameter of the receivers threaded bore has been slightly undersized to provide a tighter fit with the barrel extension, …AR-15 Lower Receiver – A Critical Junction. The lower is also responsible for attaching to the upper receiver and the receiver extension. Attaching to the upper receivers is done via two pins. If the holes for the pins are not drilled correctly, or are not even, keeping the receivers attached can prove challenging. persuasian bgc All AR15 Upper Receiver Groups; 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; 16" Mid Length Upper Group; 16" Recce Upper Groups (Mid Length) 14.5" Mid Length Upper Group; 14.5" M4 Carbine Upper Group; 12.5" Carbine Upper Group; 11 ... Best lower to use with bcm upper. Just wondering if you guys can help me out with your experiences what lower fits best with a bcm upper because I have mine on a spiked lower n it has a little too much play in it. 6. Sort by: Add a Comment. Jakemtz. • 5 yr. ago.