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The BCM Lower Group with MK2 RMS and Mod 0 Stock is a complete, ready-to-pair receiver that handles one of the biggest improvements behind the buffer tube. That's the MK2 Recoil Mitigation System, which reduces felt recoil, minimizes bolt bounce, and provides a more consistent carrier velocity than standard buffer systems. This means less jump, better control during strings of fire, and more reliable performance across a wider range of ammunition.
You're getting BCM's GUNFIGHTER components throughout. The trigger is their PNT (Polished Nickel Teflon) design, which comes ready to run without swapping. The Mod 0 stock uses a strong, lightweight polymer construction with a snag-free profile that won't catch on slings or gear. Three QD sling mount points give flexibility for how you want to attach a sling, and the modular design means you can swap stock options down the road if your needs change.
The receiver itself is forged from 7075-T6 aluminum and finished with MIL-A-8625F Type III hardcoat anodizing, the same process used on mil-spec rifles. A staked M4 lock nut keeps the castle nut secure, and the lower shelf design accommodates both RDIAS and Accuwedge use if you ever go that direction.
This comes completely assembled and ready to pair with any AR-15 upper receiver you choose. Inside, you get a mil-spec M16A4 rifle action spring with more coils than standard carbine springs, which improves consistency and widens your operating envelope. The MK2 buffer system adds internal engineering that older carbine buffers don't have. Fire controls are clearly marked SAFE and SEMI, and the enhanced trigger guard gives you better access even when wearing gloves. At 2.2 pounds, it's not light by accident, it's the result of precision machining and material selection.
The MK2 Recoil Mitigation System uses a longer receiver extension, a heavier buffer, and an M16A4 rifle spring instead of a carbine spring. This combination reduces felt recoil, minimizes bolt bounce, and provides more consistent carrier velocity. You get a smoother, more controllable shooting experience, especially during rapid fire.
Yes, this BCM lower receiver works with any standard mil-spec AR-15 upper. Just keep in mind the MK2 system is longer than standard carbine setups, so it has a different feel and function that some upper/lower combinations. Most users find it pairs well with mid-length and rifle-length gas systems.
It's completely assembled with all internals installed. All you need to do is attach your upper receiver, and you're ready to go shooting. No gunsmithing or additional assembly required.
The MK2 Mod 1 – T0 buffer weighs approximately 3.8 ounces. It's heavier than a standard carbine buffer, which is part of what helps reduce recoil and improve reliability with a wider range of ammunition.
Yes. The BCM Mod 0 stock uses a modular design with just 5 parts and 1 screw, so swapping in a different stock is straightforward. Just keep in mind the MK2 receiver extension is longer than carbine-length extensions, so not all mil-spec stocks will fully collapse all the way.
The receiver itself is marked as multi-caliber, which means it's suitable for both 5.56 NATO and .223 Remington upper receivers. The lower doesn't care what caliber upper you bolt on, as long as it's mil-spec AR-15.
| UPC | 812526023711 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | LRG-RMS-STK-MOD-0-BLK |
| Action | |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Model | |
| Product Type | Complete Lower Receiver |
| Style | Assembled |
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