VFC Umarex H&K UMP 9 GBB (DX Version) Modular Training Weapon The gearbox has a quick

The gearbox has a quick change spring feature that allows for a fast change in muzzle velocity should the circumstances demand it

System : Gas Blow Back

Conformal coating (Military Specification MIL-V-173C)

Magnification    1x

Compatible with most Eotech/Vortex/Trijicon/Sig-style magnifiers

VFC Umarex H&K UMP 9 GBB (DX Version) Modular Training Weapon The gearbox has a quickSpecification Build Material : Aluminum Alloy Fiber Polymer Magazine Capacity : 25 Rounds ( 6mm BB ) Over All Length : 450 690 mm Inner Barrel Length : 152 mm Weight : 2060g System : Gas Blowback Firing Mode : Semi Full Auto Safety Hop Up : Adjustable Rail sections included