Smith & Wesson M&P15 in 6.5 Grendel with 16-inch barrel, a mainstream AR-15 offering in the established AR-15 long-range intermediate cartridge. Type: Rifle Action: Semi-Automatic Caliber: 6.5 Grendel Capacity: 26 Year introduced: 2016, USA Weight: 96 oz Overall length: 32" Status: Active Intended use: Hunting, Sporting, Long Range