The Matrix Weaver to Weaver (W2W) rail interface adapters are a great way to mount small launchers, shotguns, and other small arms & accessories to a long-gun rail system. Initially designed as an answer to mounting small 40mm grenade pistols to rifle rail systems we quickly found that the Matrix W2W mounts are a great accessory to keep in your gear bag for a multitude of purposes. They make it possible to mount all types of railed accessories to another rail interface. Features: Adapts one rail interface to another to make a solid mounting point Universal for all Weaver and Picatinny accessory rails Great for mounting underslung launchers, shotguns with top rail, small accessories with rail interfaces Made from durable aluminum, finished with a corrosion-resistant coating Set of 2 adapters