Rocket Launcher

The M41 SSR is a heavy ordnance weapon in the UNSC arsenal that fires a 102mm Shaped-Charge High-Explosive Surface to Surface Missile. The launcher sports a 2x scope and can fire rockets over long distances with devastating accuracy, although its altitude decreases over longer distances, this model is not to be confused with the M19 SSM Rocket Launcher. The M41 is, however, identical to the M19 variant rocket launcher. The M41 uses a design unique among rocket launchers: when reloaded, the barrels are removed and two preloaded barrels are then reinserted into the unit. With this mechanism, a Marine can greatly reduce the weight he carries without throwing the weapon away like some contemporary disposable rocket launchers. This setup is very similar to that of the Javelin Anti-Tank System currently used by the U.S. military.

Pictures
http://images1.wikia.nocookie.net/halo/images/thumb/7/78/Rocket_launcher2_Halo_3.jpg/300px-Rocket_launcher2_Halo_3.jpg