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This is our CAR-15 SD 300 BLK pistol upper. It has a 5" 4150/4151 CrMoV Steel 1:5 twist barrel with button rifling and a Black Nitride finish. The muzzle is threaded 5/8x24. It also comes with a Superlative Arms adjustable gas block. The upper receiver will be black anodized. Our rail was designed to accept the HK MP5SD handguard.and is included. This is for the barreled upper only without sights,BCG or CH. Suppressor not included. Please allow 2 weeks for delivery as they are built per order.