Elite Force Airsoft Gas Gun Rebuild Kit (Model: HK UMP)

"I got this kit for the KWA mp7. Out of the kit I used the return springs, hopup, gasket, and flute valve. This pretty much restored a broken gun back to out of the box performance. Solid kit!

"I got this rebuild kit to replace the broken internal hammer and ended up using the whole kit since the other parts would break eventually. The end result was a working gas blowback pistol!

"The rebuild kit came in good time and good condition.
I used them in the KWC 1911 blowback bb pistol, and it worked fine.
The piston seal did not have the o-ring that the original had. But it seems to work fine.
At least the o-ring can't get jammed up in the air nozzle like the original one did !
I did not find a tool in the kit either!
Keep looking up! Ken.