There is also little doubt that the HK USP handgun is an amazing handgun. Unfortunately, the dust cover integral mounting rail only accepts specific flashlights. With the large number of flashlights and lasers that fit on a Picatinny or MIL-STD-1913 rail, GG&G has designed and manufactured an HK USP full size and compact flashlight mounting rail adapter meeting the Picatinny Rail specifications. FeaturesEasily installed.Picatinny (MIL-STD-1913) dovetail rail mount for lights prepared to mount on this style of dovetail.Fits Streamlight TLR-1, TLR-2 and L3 / Insight M3 and M6.Fits tightly to the USP trigger guard allowing for the rear rocker switches to be activated by the fire control finger or thumb of the off hand.Three piece, lightweight mount easily clamps onto the existing USP light rails.The rail fits tight enough to retain zero on laser sights.Manufactured from solid billet 6061-T6 aircraft grade aluminum.Type III hard coat anodized matte black per Mil-Spec.