The 3-Gun Rifle is the most complicated of the three guns from a specification standpoint. Rifles need to be set up in a manner that they can engage close targets very quickly while still being precise enough engage sub minute-of-angle targets at potential distances of 500+ yards. 3-Gun Rifles are always semiautomatic magazine fed action rifles chambered in .223 or larger. Generally they also have barrels 14.5”-18” in length, a free floated handguard, some sort of recoil reducing muzzle device. There are several viable rifle options, but 99% of 3-Gun shooters choose some sort of AR-15 style rifle.