The Bushmaster XM-15 E2S 20-inch is the full-length rifle variant of the standard XM-15 E2S carbine, featuring a 20-inch A2-profile barrel, fixed A2 stock, and A2 rear sight with elevation and windage adjustment. Built on Bushmaster's standard forged lower with E2S improvements. The 20-inch configuration provides full-velocity performance from the 5.56 NATO cartridge and mirrors the M16A2 military rifle layout. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 1995, USA Weight: 8 oz Overall length: 39.5" Status: Discontinued Intended use: Sport Shooting, Precision Shooting