Faxon Firearms Duty Series Gunner Mid-Length 5.56 Complete Upper Receiver - Suppressor Ready - 11.5"

Faxon's Duty Series 11.5-inch Gunner complete upper is built around an unusual combination: an 11.5-inch barrel running a mid-length gas system, paired with a patented adjustable gas block, Plan B-compatible flash hider, and a full BCG — a suppressor-first upper that treats suppressor compatibility as a design requirement rather than an afterthought.

The Faxon Duty Series 11.5-inch Gunner 5.56 Complete Upper is a fully assembled upper receiver group chambered in 5.56 NATO, featuring an 11.5-inch Gunner profile barrel with mid-length gas system, a patented adjustable .625-inch 3-screw low-profile gas block, a mid-length stainless steel gas tube, a Faxon MuzzLok stainless steel Plan B-compatible flash hider (1/2x28, .250-inch bore), a 10.75-inch M-LOK free-float handguard, a Faxon Superfinished 5.56 M16 Bolt Carrier Group in nitride, and a mil-spec charging handle. Enhanced forged AR-15 upper receiver. No iron sights — optics-ready flat-top.

The mid-length gas system on an 11.5-inch barrel is the configuration's defining characteristic. Most 11.5-inch 5.56 builds run carbine-length gas — shorter dwell time, faster lock time, more abrupt recoil impulse — which is tolerable unsuppressed but becomes a gas management problem once a suppressor is attached and back pressure increases. Mid-length gas on an 11.5-inch barrel produces a longer dwell time and a slower, more gradual bolt carrier velocity curve that gives the suppressor-generated back pressure somewhere to go without driving the bolt carrier back so aggressively. The patented adjustable .625-inch 3-screw gas block takes that starting point further: rather than accepting the gas system as fixed, the shooter can tune the gas port opening to dial in the exact cycling behavior they want around their specific suppressor, ammunition, and buffer setup. The Faxon MuzzLok Plan B-compatible flash hider solves the suppressor mount question at the same time — it threads directly to a Plan B or Atlas-mount suppressor without a separate adapter, and functions as a flash hider unsuppressed. The Gunner barrel profile optimizes the weight and rigidity balance for the barrel length. The included Superfinished nitride BCG reduces friction at the key wear surfaces and ships ready to install. The 10.75-inch M-LOK handguard provides full handguard length accessory attachment without covering the gas block.

Caliber: 5.56 NATO. Barrel: 11.5-inch Gunner profile. Gas: mid-length, stainless steel tube. Gas block: adjustable .625-inch 3-screw low-profile (patented). Muzzle: Faxon MuzzLok Plan B-compatible flash hider, 1/2x28, .250-inch bore. Handguard: 10.75-inch M-LOK free-float. Upper: enhanced forged AR-15. BCG: Faxon Superfinished 5.56 M16, nitride. Charging handle: mil-spec included. Sights: none — optics-ready flat-top.

Mid-length gas on an 11.5-inch barrel delivers a longer dwell time and more gradual bolt carrier velocity curve than carbine gas — the correct starting point for suppressed use where back pressure increases demand a more deliberate gas impulse. Adjustable gas block allows per-suppressor tuning without part swaps. Plan B-compatible MuzzLok eliminates suppressor mount adapter requirements. BCG and charging handle included — true complete upper, not a barreled assembly.

The right complete upper for shooters building a compact suppressed 5.56 host — mid-length gas timing, adjustable gas block, Plan B-compatible muzzle device, and a full BCG, built from the ground up for suppressor use rather than adapted to it.