The 556 brother of the G&G ARP9, the ARP556, gets the scrutiny of Delta Says. The G&G ARP 556 comes with an integrated MOSFET, aluminum body, adjustable synthetic stock, and 8mm ball bearing gearbox. It offers semi and fully automatic firing modes, folding sights mounted on a Weaver/Picatinny rail, and an accessory rail with M-LOK slots. The magazine has a capacity of 450 BBs and can fire at a velocity of 328fps.