Are they any good? Seems like even if there weren't for another 60 I could replace the whole lower parts kits "This lightweight, mil-spec, semi-automatic M-4 style rifle is optimized for high performance, and is specially designed to receive the M-203 grenade launcher. Features a 16” chromemoly steel, 1x9 twist barrel with a tactical muzzle-brake, and a precision machine cut M-203 mounting groove. Also comes with genuine Colt® M-4 handguards and a 6 position M-4 buttstock to make this a complete M-4 style weapon. If you are looking for a true M-4 solution, then this is probably one of the best you will find. FEATURES: * 16” 1 in 9" crowned chromemoly match barrel w/ M-4 cut. * M-4 CAR buttstock 6 position assembly. * M-4 handguards. (Colt) * Tactical muzzle-brake. * Caliber: 5.56mm * Detachable carry handle * (3) 30 round magazines "