The Lancer Tactical Grenade Launcher in black mounts on any standard lower rail. 40mm style. Fires all standard airsoft grenade shells (sold separately, not incldued). Designed to fit perfectly on SCAR aegs, but will work with most M4, M16, or other AEGs as well with its RIS rail attachment. When used on a M4 style, you will need to get a riser rail (see pictures) between the rail and the launcher. The SCAR does not need a riser. Other guns may or may not need a separate riser. The riser is sold separately.We also have included pictures of what it looks like on a SCAR, G&G CM16 M4 carbine, and the Grenade Launcher Platform (Lancer Tactical) as well. These are NOT included with the grenade launcher and are sold separately. The platform + this grenade launcher make a perfect combination when purchased separately and easily install together.