Caliber: 5.56 NATO - Action: Semi-auto - Operating System: Closed rotating bolt long stroke gas piston - Magazine Type: MAGPUL LR/SR25 GEN M3 - Magazine Capacity: 20 rounds - Barrel Material: Cold hammer forged CrMoV Chrome lined - Barrel Length: 16 - Overall Length: 36 (Buttstock Unfolded and Collapsed) - Weight: 8.7 lbs w/out Magazine - Rifling: Right Hand 1:12 inch twist - Stock Color: Black - Sights: Adjustable with Tritium front post and 2-dot Tritium rear aperture.