Beam Rifle

The Type-50 Sniper Rifle System, otherwise known as the Particle Beam Rifle, is a Covenant long-range weapon and the counterpart of the UNSC Sniper Rifle.

Pictures
http://images4.wikia.nocookie.net/halo/images/thumb/5/5c/Bnetbeamrifle.jpg/300px-Bnetbeamrifle.jpg