Ruger 90358 5.56 UPPER INT BBL
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Carbine receiver assembly is a standard model 5.56MM with an integral flash suppressor and fluted barrel. Overall length is 23.75 inches; barrel length is 16.12 inches with a weight of 5.29 pounds. It features a black anodized aluminum finish, folding sights, , rail covers, sight tool, soft case, manual and lock. Barrels are heavy contour (.850 inch under the hand guard), chrome lined, cold hammer forged 41V45 steel. Twist rate is 1 in 9, exterior barrel and gas block finish is Manganese Phosphate.Piston, regulator and gas block interior are chrome plated. The barrel threads are ½ inch-28 on 5.56MM. Back up iron sights are Troy Folding Battle sights. Quad rail by Troy. Barrel is not free-floated; the system is pinned together and functions like a monolithic upper. Transfer rod is not user accessible.