H&K UMAREX MP7 GBBR SACS an aluminum piston head with

an aluminum piston head with bearings and a piston with full metal teeth

Powered by a single AA battery (included)

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

- Aps Shell Catcher

Not sure which BB weight to use

H&K UMAREX MP7 GBBR SACS an aluminum piston head withFeatures 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