Want to play at indoor fields and don’t want to waste time changing springs or modifying your gun

The M4 features a 6-position adjustable buttstock that can accommodate users of any body type

Features Substantial Space for Wire Management

H&K focused on the American market when designing the USP and it is highly influenced by elements found in popular US handguns such as the 1911

Gearbox Reinforced:Re-inforced version 2

Speed Airsoft Blade Blue Special Edition (SE2) External & Internal Tunable Trigger jag Want to play at indoorSPEED M4 SE2 Tunable Trigger (new and improved version of the SPEED M4 SE, NEW Part #SA3111 to #SA3124) next level tunable trigger with no gearbox modification required great for experienced player uses stock gearbox spring one external adjustment and one internal adjustment for gearbox with stock block switch or gearbox that has upgraded MOSFET board with microswitch allowed even greater adjustability over M4 SE with more trigger performance