MPR variant of the AR-556 chambered in 6.5 Grendel with an 18-inch barrel. Uses the MPR's free-float M-LOK handguard and Magpul MOE stock. The 6.5 Grendel cartridge provides extended effective range beyond 5.56mm in the same AR-15 receiver size. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 6.5 Grendel Capacity: 26 Year introduced: 2021, USA Weight: 6.9 oz Overall length: 38.3" Status: Active Intended use: Hunting, Long Range, Range