Pro Mag Heckler & Koch USP Compact Pistol M3/6 Flashlight Adapter -

Addresses one key drawback of the H&K USP Compact's factory forward frame configuration when it comes to attaching standard rail gear to the pistol. It's a perfect fit for adding standard Weaver/Picatinny-type rail capability to the USP Compact. Easy to set and keep tight, and provides very good quality fit and finish that matches the finish of my H&K extremely well. Only downside with the unit--besides being a ProMag product--is that the front end of the adapter extends beyond the front of the pistol and as a result gets extremely dirty as it acts as an automatic catch shelf for exhaust residue exiting the forward end of the barrel. Note that ProMag has a horrible reputation for their (in)ability in providing customer support, but so far this adapter has functioned good enough to not require any follow-up help (thank the ballistic firing gods).