Noveske fourth-generation N4 with proprietary Switchblock adjustable gas system. The Switchblock allows the user to select between normal and suppressed gas settings without tools, optimizing bolt velocity for both suppressed and unsuppressed fire. 16-inch Noveske Matched barrel. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2017, USA Weight: 104 oz Overall length: 33" Status: Active Intended use: Tactical, Law Enforcement, Suppressed Shooting