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* 5.56x45mm NATO Gas Operated Short Stroke Piston with 3 Position Adjustable gas key* Built to exceed NATO test protocols; Bore Obstruction and "Over the Beach" Testing.* Forged 7075 Hard Coat Anodized upper and lower receiver set* 9 Handguard with key lock anti-cant, integrated QD points and Mlok(R) attachment system* QPQ 4150 CMV Barrel with Caracal(R) Barrel Extension and Chamber Design* QPQ BCG, Caracal(R) Anti Tilt Carrier with Carpenter 158 Bolt.