It comes packaged with the Tri-Strike.
The launcher piece can be attached to almost any blaster via tactical rail; there is an additional tactical rail on top of it. On back of the launcher is a shoulder stock attachment point, which allows it the shoulder stock to be attached to it for use as a standalone blaster.
Built into the stock piece is the priming/firing handle. A plastic tube connects both parts together and delivers air from the pump to the launcher itself.
Reloading and firing
To reload the Missile Launcher Stock, load a single Elite Missile into the front of the launcher piece.
Pull back the handle in the stock piece and push it forward to fire the Elite Missile.