The Maxim Defense MD1000 chambers the .450 Bushmaster in the company's ultra-short 5.5-inch barrel PDX format. The .450 Bushmaster provides massive terminal performance from a compact AR platform, making it one of the most powerful small AR-pistols available. Type: Pistol Action: Direct Impingement Caliber: .450 Bushmaster Capacity: 5 Year introduced: 2021, USA Weight: 5.5 oz Overall length: 19" Status: Active Intended use: Home Defense, Hunting