| Barrel: 16" Length w/ flash hider (birdcage) 4140 chrome-moly steel manganese phosphated 6 grooves, right-hand 1x9 twist, button rifled Chamber: 5.56x45mm Method of Operation: Gas operated rotating bolt Bolt & Carrier: 8620 steel bolt carrier, heat treated and plated per Mil Spec Phosphated steel bolt, heat treated and plated per Mil Spec Sights: A2 front sight Assembly Weight: Empty - 6.9 lbs. Length: Extended: 35 1/2" Collapsed: 31 3/4" | Upper Receiver: A2 fixed carry handle and rear sight adjustable windage and elevation, Forged 7075-T6 aircraft aluminum alloy Hard coat annodized per Mil Spec and teflon coated black Dust cover Shell deflector Round forward assist Right hand ejection Lower Receiver: Forged 7075-T6 aircraft aluminum alloy Hard coat annodized per Mil Spec and Teflon coated black Semi-auto trigger group Aluminum trigger guard Aluminum magazine release button Stock: AP4 - 6 position, telescoping fiber reinforced polymer Handguards: GlacierGuards Oval, Carbine length Aluminum Delta Ring |