The BRO SPEC15 Carbine rifle has a black anodized forged aluminum upper/lower receiver, 16" M4 profile 4150 chromoly barrel, and a black nitride coated bolt and carrier group marked with Black Rain's distinctive bio-hazard logo. SPECIFICATIONS: Mfg Item Num: BROSPEC15 Category: RIFLES CENTERFIRE TACTICAL Action :Semi-Automatic Caliber :223 Remington/5.56 NATO Barrel Length :16" Capacity :30+1 Trigger : Safety : OAL :32.5" Weight :7.4 lbs Stock Description :Magpul MOE Black Metal Finish :Black Hard Coat Anodized Muzzle :A2 Flash Hider Receiver Material :Aluminum Sights :None, Optic Ready Barrel Description :4150 Chrome Moly Twist :1:7" Hand :Right Stock Finish Group :Synthetic Metal Finish Group :Blued/Black