AR Five Seven Complete assembly with standard 16.04" Barrel

Now shoot the exciting and economical 5.7x28mm cartridge on your standard AR-15 lower (NOT included or available from Area 51). No FFL required as this is just an upper receiver group!.Spent cartridge cases eject downward through your AR-15 magwell, so the AR five seven is the ultimate in ambidextrous weaponry! Magazines are available in 10, 30 and 50 round capacity, all in the same incredible low-profile form factor. The AR Five Seven Upper is fully compatible with all mil-spec AR-15 lower receiver units.

Complete assembly with standard 16.04" Barrel, Flash Suppressor, Bolt, and "Carbine" Buffer. Magazine not included.

Please note: A2 type / "Butt Stock" / "Rifle Stock" lower receivers require AR57-A2 Buffer. Please refer to the Product Catalog or contact us for further details.