Ultra-compact M&P15 Pistol with a 7.5-inch barrel and SB Tactical brace. At this barrel length, 5.56mm velocity drops significantly but the platform remains useful for CQB and serves as a popular suppressor host when threaded. Type: Semi-Auto Pistol Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2017, USA Weight: 5.5 oz Overall length: 23.5" Status: Active Intended use: Home Defense, Range