This Rock River .308 is an interesting one! Not only does it have a 20-inch barrel but it uses FAL mags steel or plastic. It has a part carbon fiber stock paired with a nice handguard and small pic rail for a bipod up front, and has an extended charging handle. Type: Semi-automatic rifle (AR-10 style Caliber: .308 Winchester / 7.62x51mm NATO Operation: Direct-gas-impingement Magazine: Uses FN-FAL pattern magazines (Rock River makes their own polymer versions) - surplus FAL mags also fit. Accuracy: Often guaranteed ~1 MOA with quality ammunition (can hold tighter with match ammo).