The AR-57, also known as the AR Five-seven, is an upper receiver for the AR-15/M16 rifle lower receiver, firing FN 5.7×28mm rounds from standard FN P90 magazines.
The PDR-C (Compact) features an FN P90-style pistol grip and ergonomics offering a more compact weapon, while the PDR-D (Direct) uses a more conventional pistol grip with vertical grip (similar to a Steyr TMP) and safety nub to keep users from injuring themselves.
FN P90 |
This is intended to give the PP-2000 armor-piercing capability comparable to the FN P90 and Heckler & Koch MP7 personal defense weapons while also being able to use common 9mm Parabellum rounds.