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The BCM Complete Lower Receiver is a fully assembled, ready-to-build foundation for your next AR-15 project. Machined from 7075-T6 aluminum forgings and finished with MIL-A-8625F Type III Class 2 hardcoat anodizing, this lower comes from the factory complete with all internal components pre-installed. You won't need to source parts separately or deal with the assembly process, which makes it a straightforward option whether you're building your first rifle or adding to an existing collection.
This lower ships with BCM's Mod 2 SOPMOD widebody stock, which delivers a pronounced cheekweld and snag-free geometry. The stock features ambidextrous rotation-limited QD sling mounting and an improved vehicle-borne operations sling tab. Unlike basic M4-style stocks, the Mod 2 gives you better ergonomics for both precision and dynamic shooting applications.
Instead of a standard carbine buffer system, this lower includes BCM's MK-2 recoil mitigation system. It sits between rifle-length and carbine-length setups, giving you the length-of-pull of a rifle stock with the adjustability of a carbine. For short-barrel rifles or suppressed builds, the MK-2 system reduces felt recoil and improves reliability by managing the carrier velocity more consistently.
The PNT trigger features a polished nickel-Teflon finish that delivers a smooth, consistent break with minimal creep compared to standard mil-spec triggers. The enhanced trigger guard provides extra clearance for gloved hands, keeping the controls accessible in cold weather or tactical gear. You also get the BCM pistol grip with its modern angle and aggressive texturing for secure handling. Three rear sling mounts and a properly staked M4 lock nut round out a rifle that's truly ready to go.
Yes, this complete lower is built to mil-spec standards and will accept any mil-spec AR-15 upper receiver. It's designed for full compatibility with a wide range of uppers and parts, making it a versatile platform for different builds or configurations.
The MK-2 sits between rifle and carbine length systems, providing the length of pull of a rifle stock with carbine adjustability. It delivers more consistent carrier velocity for better accuracy and reliability, while also reducing felt recoil. This setup is especially beneficial for short-barrel rifles and suppressed builds.
BCM builds all their complete lowers at the factory with precision assembly and rigorous quality control. Coming fully assembled eliminates assembly errors, ensures proper staking and torque on critical components, and gives you a ready-to-build platform without the hassle of sourcing individual parts.
The PNT features a polished nickel-Teflon coating that hand-polishes the sear surfaces for increased smoothness. Most users report a cleaner break with minimal creep compared to standard mil-spec triggers, making it suitable for both precision shooting and combat-style builds.
Factory blem refers to cosmetic imperfections like minor surface marks or anodizing inconsistencies that don't meet BCM's aesthetic standards but don't affect the receiver's structural integrity or performance. The lower functions identically to a non-blem receiver.
| UPC | 812526024282 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BCMLRG-STK-MOD-2-SPMD-FDE-COSMO |
| Action | |
| Caliber/Gauge | Multi |
| Color | Flat Dark Earth |
| Model | |
| Product Type | Complete Lower Receiver |
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