The Faxon Duty Series 16″ Gunner 5.56 Complete Upper – Suppressor Ready is a duty-grade turnkey upper receiver group engineered for reliable suppressed performance and hard use. Built around the proven 16″ Duty Series Gunner Barrel and tuned with a Faxon patented adjustable gas block this upper delivers smooth cycling and consistent function—ideal for training defensive use and suppressed setups. Unlike a barreled upper this is a complete upper and ships ready to run with a Faxon Super finished M16 Bolt Carrier Group (Nitride) and a MIL-SPEC charging handle. Up front a Faxon MuzzLok Plan B-compatible flash hider supports common Plan B mounting systems and makes this upper an excellent suppressor host.