BCM Lower Receiver Group, MK2 Extension, Stock Mod 0, FDE

Description

The BCM MK2 Complete Lower Receiver with Mod-0 Stock in Flat Dark Earth is built for shooters assembling a complete AR-15 in a coordinated FDE finish, particularly those running short-barreled configurations where standard carbine buffer systems can produce harsh cycling and elevated felt recoil. It ships fully assembled with grip, stock, and buffer system already installed, so it mates directly to any Mil-Spec complete upper without additional lower parts sourcing.

The defining feature here is the MK2 buffer system, which sits at an intermediate length between a standard carbine and a rifle-length buffer setup. That positioning gives it the longer length of pull associated with a rifle stock while retaining the adjustability of a collapsible carbine design — useful when the same rifle needs to fit different shooters or be used with body armor. The intermediate buffer geometry also helps smooth the bolt carrier’s rearward travel, which is most noticeable on shorter barrels where carbine-length gas systems tend to run overpressured and abrupt.

The receiver itself is forged from 7075-T6 aluminum and finished in hardcoat anodize beneath the FDE furniture, meaning the structural material is protected even where the exterior color is not. An enlarged polymer trigger guard comes pre-installed, which makes a meaningful difference when shooting in gloves. The Mod-0 collapsible stock provides length-of-pull adjustment across multiple positions, and the BCM grip is oriented for a neutral, comfortable wrist angle during sustained use.

This lower is a practical starting point for desert-tan or FDE-themed builds where matching the lower and upper furniture matters, or for any builder who wants the MK2 recoil management system without assembling components individually.

Shipping and availability: This item must ship to a licensed FFL dealer for transfer.