The USP compact rail converter from NC STAR (MCUSP) is ideal in converting your compact USP H&K style rail system to a standard picatinny rail. This will fit USP Compact Pistols, including training replicas like the KWA USP Compact.
NcSTAR USP Compact Rail Adapter Features:
-Converts HK Rail to Picatinny Rail
-Weight: 1.0 oz
-Length: 2.7 inch