The 5.56x45mm Service Rifle in Fallout: New Vegas. The weapon is favored by the NCR but is used by other factions, including Caesar's Legion and The Powder Ganges. The rifle looks to be a cross of a Colt AR-10 and a Colt M16A1. Also the Stock, Pistol Grip and Hand Guard is wooden, not metal. The rifle can be found on most NCR Soldiers.