USC to UMP Conversion: To convert your HK USC to a look like a UMP a minimum of 5 parts are needed: UMP Stock, Stock Axle Pin, HDPS Stock Block, UMP Lower, UMP Magazine. In addition 3 US made parts need to be added for 922(r) compliance. The following are listed as suggested items: Sear, Trigger, Magazine Kit, UMP 922r Full List. Although many customers complete the conversion by themselves we recommend that the conversion be done through a qualified gunsmith.
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