Quick view Primary Weapons Systems Primary Weapons Mk1, Pws 22-2m100sm1b Mk1 Mod2 Strp Lower $279.95 Pws mk1 mod 2-m multi-caliber lower, t6 7075 forged, hard coat black anodized per mil-a-8625f type iii class 2, ar-15 compatible.Proprietary parts included: left side magazine release, bolt catch spring, bolt catch screws, tension screw, bolt release... Compare Add to Cart