The MK1 MOD 2-M is a multi-caliber lower made from 7075-T6 forged aluminum with a hard coat black anodized finish and is AR-15 compatible. The following proprietary parts are included: Left side magazine release, Bolt catch spring, Bolt catch screws, Tension screw, Bolt release lever, Bolt release through pin. NOTE: Requires a lower parts kit, buffer & stock of your choosing to complete.

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