Designed for the M203 40mm tubes. CNC machined aluminum.Three 2.5" MIL-STD 1913 Picatinny railAdaptor allows mounting of light/laser, forward vertical grip, bipod and moreEasy to fit/remove and secured by Allen boltsPart #: XGL203 [GLA40]Fits: M203Made of: AluminumWeight (oz.): 4.93Length (in.): 2.59"Height (in.): 2.59"Width (in.): 3"