Windham Weaponry SRC-300 AR-15 in .300 Blackout with 16-inch barrel, a standard-configuration rifle from the Maine manufacturer in the subsonic-capable cartridge. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2015, USA Weight: 96 oz Overall length: 32" Status: Active Intended use: Hunting, Tactical, Suppressor Host