Wilson Combat's proprietary 7.62x40 Wilson Tactical cartridge in a 16-inch AR-15 carbine. The 7.62x40 WT fills the gap between 5.56mm and .300 BLK in an AR-15 receiver using standard STANAG magazines modified to single-stack for the longer cartridge. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 7.62x40mm WT Capacity: 30 Year introduced: 2010, USA Weight: 6.9 oz Overall length: 34.5" Status: Active Intended use: Hunting, Range