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lightweight alternative to standard ste
if used with the guns original hop-up chamber and bucking
INCREASED FPS
The dual solenoid design of the F2 provides the same functionality as the legendary Fusion Engine but in a more compact
Elite Force Rebuild Kit for HK UMP Airsoft Pistols hi-capa grip lightweight alternative to standard stePick up one of our HK UMP GBB Rebuild Kits. It's got all the parts you need to bring back the joy you experience when firing your gas blowback UMP on full auto . So you caught the broadside of your buddy's helmet with your HK UMP GBB SMG during some intense close quarter battle action and now the bolt doesn't quite cycle with a snap like it used to. Never mind the hurt you just brought to your battle buddy's brain bucket, you've got a gun to fix!