The GG&G Slim Line USP M3/M6 Adapter consists of a three piece lightweight aluminum adapter that easily clamps over the existing USP light rails. The installation only requires a small wrench, included in the package. The rail fits tight enough to retain zero of the M6 laser. The GG&G Slim Line USP M3/M6 Adapter is machined from 6061 T6 aircraft-grade aluminum alloy using modern CNC machinery. It is then hard-coat anodized matte black per mil spec.

The GG&G UFIR can be easily installed onto the underside of the of an MP5 handguard using simple hand tools and a small amount of 262 Loctite. Detailed installation instructions and all of the parts required are supplied in the kit. GG&G’s UFIR is manufactured from 6061 T6 aluminum alloy and is hard coat anodized flat black per mil spec. As can be seen in the photographs, the UFIR is contoured to fit the MP5 foregrip and provides a solid, rugged mounting platform. This four inch accessory rail is machined to MIL-STD-1913 specifications.