Description
HK UMP, USC - Left Side Hammer Spring For All Lowers
New U.S hammer spring- Left Side A high wear item that needs to be changed when light firing pin strikes develop on your USC or UMP firearm.
Fits all:
- HK UMP models 45, .40 & 9mm
- USC .45 and other conversion models
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HK UMP & USC - Left Side Hammer Spring For All Lowers
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