The Mossberg 100ATR (All-Terrain Rifle) is a bolt-action rifle. The firearm was specifically designed for hunting as a quality hunting rifle. The Mossberg 100ATR is offered in four calibers: .270 Win, .30-06 Sprg., .243 Win, and .308 Winand features a free-floating, button fired barrel. It has a side lever safety for convenience as well as an all-steel machined receiver for consistent operation. In combination, these features provide hunters a very accurate and high performing firearm, without the need for a lot of maintenance.