M&P 15-22 with a factory-threaded and suppressor-optimized barrel. The barrel timing is tuned to cycle with subsonic .22 LR more reliably than the standard-threaded variant. Type: Rifle Action: Semi-Auto Caliber: .22 LR Capacity: 25 Year introduced: 2018, USA Weight: 87 oz Overall length: 36" Status: Active Intended use: Plinking / Range Training, Suppressor Shooting