Suppressor-Direct-Impingement M400 — suppressor-optimized with adjustable gas block and enhanced bolt carrier. Designed to cycle reliably suppressed without adjustment. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2019, USA Weight: 112 oz Overall length: 32" Status: Discontinued Intended use: Service, Home Defense