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The BCM Lower Receiver with MK2 Recoil Mitigation System and Mod-0 Gunfighter stock brings BCM's proven engineering to a complete, ready-to-build platform. This is a fully assembled lower that ships with all internals pre-installed, so you're just one good upper away from a complete rifle.
At the core, the receiver is machined from 7075-T6 aluminum forgings and finished with military-spec hardcoat anodizing (MIL-A-8625F, Type III, Class 2). This isn't just tough in the abstract sense—it's durable enough to withstand real use without degrading under typical field conditions. The Flat Dark Earth finish matches just about any modern rifle build aesthetic.
What sets this lower apart is the BCM MK2 buffer system, which works differently than a standard carbine setup. Instead of the typical three-weight carbine buffer, the MK2 uses an 8-position receiver extension that's roughly three-quarters of an inch longer and pairs with a rifle-length action spring. This longer spring spreads the force over more coils, making the system less picky about ammunition quality and cleanliness. The MK2 Mod 1-T0 buffer that comes installed weighs about 3.8 ounces and reduces felt recoil while improving reliability without making the gun sluggish. If you run different barrel lengths or shoot suppressed, the MK2 system handles that better than conventional setups.
BCM includes their polished nickel teflon (PNT) trigger—a mil-spec-grade trigger with hand-polished sear surfaces that feel notably smoother than standard parts. The Gunfighter Mod-0 stock is a lightweight polymer design with snag-free edges and a modular VBOST (Vehicle Borne Operations Sling Tab) for vehicle mounting. You also get the enhanced trigger guard for gloved operation, a Mod-3 pistol grip, and a QD sling mount end plate already installed and properly staked. Everything comes marked SAFE and SEMI.
This is a complete lower in the sense that it's fully assembled and ready to go, but you'll still pair it with an upper receiver to create a functional rifle. It's configured for .223 Rem/5.56 NATO and works with any mil-spec upper. Multiple users report excellent quality control, tight tolerances, and immediate function once paired with a quality upper.
Yes, it ships completely assembled with all internals, trigger group, buffer system, stock, and grip already installed. You just need to attach a complete AR-15 upper receiver to create a functional rifle. It's ready to accept any mil-spec upper right out of the box.
The MK2 uses a longer receiver extension (about 0.75 inches longer) paired with a rifle-length action spring instead of a carbine spring. This spreads the recoil force over more spring coils, making the system less sensitive to ammunition quality and cleanliness while reducing felt recoil. It's also more reliable when running different barrel lengths or shooting suppressed.
No, the MK2 buffer system is semi-proprietary. The longer receiver extension requires the BCM MK2 buffer and rifle-length action spring—standard carbine buffers and springs won't work. The stock that comes on it is compatible with mil-spec dimensions, but the buffer tube is different.
BCM's PNT (Polished Nickel Teflon) trigger features hand-polished sear surfaces that are up to 300 percent smoother than standard mil-spec. It has a cleaner break with minimal creep while maintaining full mil-spec reliability and durability.
Yes. Since it comes fully assembled with quality components pre-installed, a new builder only needs to source a complete upper receiver and attach it via two pins. The hard part is already done, and you avoid the complexity of assembling a lower parts kit.
FDE is a neutral color that works well in most environments and looks cohesive with most modern rifle builds. It's also easier to touch up than black if the finish takes minor dings, and it won't show dust and dirt as visibly as darker finishes.
| UPC | 812526023728 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | LRG-RMS-STK-MOD-0-FDE |
| Action | |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Flat Dark Earth |
| Model | |
| Product Type | Complete Lower Receiver |
| Style | Assembled |
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