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With this combo set you have everything you need to legally convert your standard USC Thumbhole Stock and 10 rounds mag to UMP Pistol Grip and hi capacity mag. All HK German parts are new, the 3 U.S. HDPS made compliance parts are already installed (steel trigger, follower and floor plate)those parts make the conversion legal per ATF rules, the lower already serviced to make it compatible with the USC upper.
Combo components:

PARTS- HK UMP lower, HK UMP folding stock, HK Folding stock axle pin, HK UMP buffer, HK USC internals *, HDPS stock block B with steel screws, 2 U.S. UMP 25 rds magazines, (the 3 U.S. required compliance parts are included)

SERVICE INCLUDED- Fill and Mill auto sear area, make UMP lower compatible with USC upper, replace all UMP parts with USC parts, replace mag followers and floor plates and for the NAVY style UMP lowers, invert white mark on right side USC selector, R&R all parts and check dry fire function test.

*You will need send your USC lower in order to use your semi auto internals

* You can also send your upper receiver for milling services, ($25 for UMP mag area milling, needed in order to work) and ($85 for milling the 5 UMP  front vents, for looks only)