S&W M&P 15-22 AR-style .22 LR. Identical ergonomics to a centerfire AR-15 — the best AR training tool. Type: Rifle Action: Semi-Auto Caliber: 22 LR Capacity: 25 Year introduced: 2009, USA Weight: 3.5 oz Overall length: 33.25" Status: Active Intended use: training, plinking