Franklin Armory's F17 M4 features a 4140 Chromoly Steel 16" medium contour barrel with a salt bath Nitride chamber, bore, & finish, threaded muzzle crown, and an A2 flash hider. Its upper and lower receiver are forged from 7075-T6 aluminum with a hard coat type III anodized black finish. The stock is a M4 six-position with a rear sling mount. Included is a complimentary lockable case.