H&K UMAREX MP7 GBBR SACS the N7 Gen-2 fills an

the N7 Gen-2 fills an internal air chamber at the pressure set by the users external supply regulator

Not sure which BB weight to use

35mm Overall Height: 27mm Hub Outer Diameter (to fit into Gear Box): free size Hub Outer Diameter (to fit into Outer Barrel): min 12mm Hub Inner Diameter (to fit Nozzle): max 8

Compact size – fits perfectly inside any double M4 mag pouch to easily be carried in to the field

Battery compartment for Nunchuck / Butterfly batteries

H&K UMAREX MP7 GBBR SACS the N7 Gen-2 fills anFeatures Light weight and high strength polymer frame w fully trademarked H&K Heckler & Koch Engraving Compact design; great as a sidearm or primary weapon Realistic, hard kick blowback Telescopic two position retractable stock with rubber buttpad Metal rails, flashhider, magazine, fire selector, slide release, iron sight and retractable stock Integrated flip down vertical grip Completely ambidextrous: Ambidextrous firing selector switch, bolt