The Black Rain Ordnance Spec series is a line of AR15 rifles and pistols built to meet bid requirements for law enforcement and military personnel and as an affordable option for civilian use.The SPEC15 Carbine uses a direct impingement gas system has a nonadjustable gas block and a salt bath BCG. It has a billet 7075 T6 aluminum upper and lower receiver 4150 chormoly barrel and a 12 MLok hybrid handguard. This model has 16" barrel with a black nitride finish A2 flash hider Enhanced G.I. Sopmod buttstock and a black hardcoat anodized receiver finish."