The Bushmaster Minimalist SD (Suppressor Direct) is a suppressor-optimized AR-15 carbine featuring an adjustable gas block, a mid-length gas system on a 16-inch barrel, and the Magpul Minimalist stock for reduced overall length. Factory-tuned for use with suppressors at the gas system level. A collaboration-influenced design that addressed the growing suppressor market. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2016, USA Weight: 6.3 oz Overall length: 33" Status: Discontinued Intended use: Sport Shooting, Tactical