Awesome wee piece here, ARP556 that comes with; 552 Holo sight, Metal hi-cap Mag 450 round capacity, MP5 Mag adapter, Straight MP5 Hi-Cap Mag 200 Round capacity. Also has had a buffer tube fitted with an easy access stock for battery placment.
Shoots 320 -330 fps on a 0.20g bb w/ 11.1v lipo battery.