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 non-adjustable gas block, and a salt bath bcg.It has a billet 7075 t6 aluminum upper and lower receiver, 4150 chormoly barrel and a 12" m-lok 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.Metal Finish: Black Hardcoat Anodized/Black NitrideAction: Semi-AutoCaliber: 300 BlackoutBarrel Length: 16"Capacity: 30+1Trigger: G.I. TriggerOal: 34"Weight: 7.50 lbsStock Description: Enhanced G.I. SopmodMuzzle: A2 Flash HiderReceiver Material: 7075 T6 AluminumSights: None, Optic ReadyBarrel Description: 4150 Chrome Moly M4 ProfileTwist: 1:8"Barrel Length Range: 16" to 16.99"Weight Range: 7 lbs to 7.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black