For sale is a AR Five Seven AR57 semi-automatic rifle in 5.7x28mm. Serial number- KAI 02369. This rifle is in good condition and comes with a vertical foregrip and a 50-round FN P90 magazine. It features a Spikes Tactical ST-15 lower receiver but its true feature is the hard-to-find AR Five Seven AR57 upper that converts the rifle to shoot 5.7x28mm and accept P90 magazines. Manufactured by the eponymous AR57 LLC, and chambered in 5.7x28mm, this upper is less powerful than the standard 5.56mm version, but it has certain tangible advantages, including reduced muzzle blast, a high practical rate of fire, nonexistent recoil, and the ability to use folding stocks. Since the buffer is located within the receiver, folding stocks may also be used for compact storage or carry. Empties eject downward through the nominal magazine well. Some people use a 20-round magazine body with the feed lips, spring, and follower removed to act as a brass catcher.
V2-A6
Barrel Length: 16
Bore condition: Good