Umarex(VFC) UMP 9 , UMP45 Hop-Up lever
cults3d
Due to the Original Hop lever being too loose also cannot maintain vertical hop and the pressure point is too tiny for GBB. This Lever has a wider profile to reduce wobbling and a concave pressure point to gain a better hop effect. *Updated (Late 2022) The soft nub version is tested and proven to be more consistent than the earlier version. (Required cylinder/flat/bridge/etc. nub) The old version is still included so you may tweak this design to gain better performance.
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