Caliber: .223 Rem./5.56mm NATO. Similar to A1 Government internally. Barrel: 16 in., Superlight with Melonite QPQ Finish and A2 flash suppressor, M4 Feed Ramps, 1:9 rifling. Flattop-type upper receiver. Forend: Single-layer Heat Shield Handguard, A2 black plastic grip. Sights: None, optics ready. Six-position telescoping buttstock. Weight: 5.85 lbs. Length: 32.5-36.25 in.