Standard Mfg. STD-15 AR-15 Carbine .223/5.56, 16 Barrel, 13 M-LOK Rail, Black, 30rd Mag, USED, UNFIRED WITH FACTORY BOX. The Standard Manufacturing Company is proud to offer our new 16721 model. Completely built by our master gunsmiths with major components made in-house to unprecedented tolerances. Our sporting rifles have become highly sought after by novice and expert shooters alike due to their excellent accuracy and reliability which can only come from controlling all aspects of the manufacturing process. Do not confuse our sporting line of rifles with inferior guns which are built to a price point; which means the least expensive components available, on the contrary, you are assured piece of mind knowing that your Standard Manfuacturing 16721 is built by the most innovative and quality-oriented company in the business which we have become known for.BARREL: 16 5.56 Caliber 1/8 Twist 4150 CMV Heavy Profile With M4 Feed Ramp. GAS SYSTEM: Direct Impingement, Carbine Length UPPER RECEIVER: A3 Mil-Spec 7075-T6 Aluminum With Mil-Spec Hard Anodized Finish. LOWER RECEIVER: Low Shelf 7075-T6 Aluminum With Mil-Spec Hard Anodized Finish. BOLT CARRIER: Salt Bath Nitride Carrier Group Made of 8620 Steel MAGAZINE: 30 Round, 2 Included CHARGING HANDLE: Standard Charging Handle MUZZLE: A2 Flash Hider TRIGGER: Mil-Spec STOCK: Rogers Super Stock HANDGUARD: 13 M-Lock Handguard PISTOL GRIP: Mission First EPG16V2 BUFFER TUBE: 6 Position Carbine Buffer Tube LENGTH: 32-35.5 WEIGHT: 6.4 lbs.