Windham's MPC in .450 Bushmaster, offering straight-wall cartridge compliance for states restricting bottleneck rifle cartridges for deer hunting. Shares the standard AR-15 lower with a dedicated upper, barrel, and magazine. Type: Rifle Action: Semi-Automatic Caliber: .450 Bushmaster Capacity: 5 Year introduced: 2016, USA Weight: 112 oz Overall length: 33.5" Status: Active Intended use: Hunting, Deer, Straight-Wall States