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BCM Complete Widebody Lower w/ MK2RMS-M1T0 MOD-2 SOPMOD FDE

UPC: 812526023957

$559.00

8 in stock

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Description

This is a fully assembled AR-15 lower receiver from Bravo Company that hits different than standard offerings. It comes out of the box ready to mate with any mil-spec compatible upper receiver, meaning no gunsmithing or trips to the bench before you're ready to shoot.

The standout feature here is the MK2 Recoil Mitigation System. Instead of a basic carbine buffer setup, BCM engineered this system to sit between rifle and carbine length. What that means in practice is a longer receiver extension with a tuned buffer that keeps felt recoil down without sacrificing reliability. The system uses more spring coils than a standard M4, giving you better consistency and a wider operating envelope for different ammunition and configurations. You also get less bolt bounce and carrier tilt, which translates to a noticeably smoother shooting experience, especially during rapid fire or when running suppressed.

BCM Mod 2 SOPMOD Widebody Stock and Ergonomics

The Mod 2 SOPMOD widebody stock isn't just a different shape. It features a pronounced cheekweld that sits up higher on your face for better sight picture, a snag-free design with no sharp edges, and an integrated VBOST sling tab for vehicle-borne operations. The widebody profile gives you more contact area without adding weight. You get 3 QD mounting points on the back plus the end plate's QD option for serious flexibility in how you run slings. Everything about the stock geometry was refined for both precision work and dynamic shooting.

Built the BCM Way

The receiver itself is forged from 7075-T6 aluminum and hardcoat anodized to mil-spec (MIL-A-8625F Type III Class 2), giving it durability that handles repeated use without degrading. The flat dark earth finish matches the furniture and looks clean. You're getting all the internal goodies too: the BCM PNT trigger with polished nickel-teflon coating, an enhanced trigger guard with more room for gloved hands, the BCM Gunfighter pistol grip, and a properly staked M4 lock nut. Every part is mil-spec, which means compatibility isn't a concern when you're hunting for uppers or need parts down the line. This lower runs multi-caliber, so you can build a 5.56, 300 Blackout, or whatever else mil-spec diameter you want.

Key Specifications

  • Manufacturer: Bravo Company Manufacturing (BCM)
  • Model: BCM4 MK2
  • Manufacturer Part Number: LRG-RMS-STK-MOD-2-SPMD-FDE
  • UPC: 812526023957
  • Receiver Material: 7075-T6 Aluminum Forging
  • Receiver Finish: Hardcoat Anodized Black (MIL-A-8625F Type III Class 2)
  • Furniture Color: Flat Dark Earth
  • Stock: BCM Mod 2 SOPMOD Widebody
  • Pistol Grip: BCM Gunfighter Mod 4
  • Trigger: BCM PNT (Polished Nickel-Teflon)
  • Trigger Guard: BCM Enhanced (Enlarged Polymer)
  • Buffer System: BCM MK2 RMS (Recoil Mitigation System) with Mod 1 T0 Buffer
  • Receiver Extension: 7075-T6 Mil-Spec (MK2 Length, approximately 3/4" longer than carbine)
  • Sling Mounts: Qty 3 Rear QD Mounts, QD End Plate
  • Caliber: Multi-Caliber (.223/5.56 NATO compatible)
  • Country of Origin: Made in USA

What’s Included

  • Fully assembled BCM lower receiver (7075-T6 aluminum, hardcoat anodized)
  • BCM Mod 2 SOPMOD widebody stock
  • BCM Gunfighter Mod 4 pistol grip
  • BCM PNT (Polished Nickel-Teflon) trigger assembly
  • BCM Enhanced trigger guard
  • BCM QD sling mount end plate
  • BCM MK2 receiver extension with MK2 Mod 1 T0 buffer
  • USGI H buffer (1 tungsten, 2 steel counterweight)
  • Mil-Spec M16A4 rifle spring
  • Staked M4 lock nut
  • All lower parts kit internals

Frequently Asked Questions

Will this BCM lower work with any AR-15 upper receiver?

Yes, it's built to mil-spec standards and compatible with any mil-spec AR-15 upper receiver. The flat top receiver and standard takedown lugs mean you can match it with uppers from BCM, aero, or any other manufacturer that builds to mil-spec. Just make sure whatever upper you pair it with is mil-spec diameter for a solid fit.

What's the difference between the MK2 buffer system and a regular carbine buffer?

The MK2 system uses a longer receiver extension that sits between carbine and rifle length, paired with a tuned buffer design. You get more spring coils for better consistency, less felt recoil, reduced bolt bounce, and improved dwell time. It's especially noticeable when running suppressors or shorter gas systems, and it helps with reliability when using lower-power ammunition.

Is this lower receiver adjustable and does it have the right length of pull for me?

The Mod 2 SOPMOD stock is adjustable with 6 position settings on the receiver extension, so you can dial in length of pull for your body and how you run gear. The widebody stock also has better ergonomics than a standard stock, with a more pronounced cheekweld and snag-free design that works well for both precision and tactical use.

Do I need any tools or gunsmithing to get this lower ready to build on?

No. This comes fully assembled with all internals already installed. You just need to attach a mil-spec upper receiver using two takedown pins, which takes about 30 seconds. No tools required to complete a basic two-pin build.

Can I use this lower for a short-barrel rifle or suppressed build?

Yes. This is actually a great choice for those applications because the MK2 system was designed to handle shorter gas systems and suppressed rifles more reliably than a standard carbine buffer. The improved dwell time and reduced carrier tilt help maintain reliability when you don't have full-length gas tube dynamics.

What trigger is on this lower and can I upgrade it?

It comes with the BCM PNT (Polished Nickel-Teflon) trigger, which is a quality mil-spec trigger with a smooth break. If you want something different, the lower accepts any mil-spec trigger group since all the pin holes and dimensions are standard. However, many builders find the PNT good enough to keep as-is.

Additional information

UPC

812526023957

Manufacturer

Manufacturer Part Number

LRG-RMS-STK-MOD-2-SPMD-FDE

Color

Flat Dark Earth

Style

Complete

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