This is the famous M203 Military Type Grenade Launcher. It is the exact replica of
the barrel mounted version used by the elite forces throughout the world. The
M203 Military Type Grenade launcher comes with everything you need to mount
on your tactical barrel.
The Real Action Paintball Tippmann X7 Phenom M203 Military Grenade Launcher is newer, so it should be commonly available, both new and used.