The M45 Grenade Launcher is an attachment to the BR55 Battle Rifle appearing in Custom Mapping Team's mod of the Halo: Combat Evolved campaign. All Battle Rifles in the game have it. They must be reloaded after every shot, and while the player is wielding the BR55 with the M45. You cannot throw hand grenades. While it is weak against infantry ( killing an elite or a brute with two shots ) its strong against light vehicles ( destroying them with one to two shots ), but you should be cautious. ( especially when playing on legendary )When you are attempting to destroy vehicles with it. Because it has a very short range, and an enemy vehicle can kill you from a longer range.