GG&G, Inc. Fits Streamlight TLR-1, TLR-2 and L3 / Insight M3 and M6, Lightweight Mount, Full Size, Type III Hard Coat Anodized Matte Black Finish, Slim Line, HK USP GGG-1133SP 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 flashlight mounting rail adapter meeting the Picatinny Rail specifications. 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.