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Faxon Firearms Duty 16" 5.56 NATO Complete Upper Receiver FXURGD55616SA13CSR UPC 810209950675
Product Description
The Faxon Firearms Duty 16" 5.56 Complete Upper Receiver (MPN: FXURGD55616SA13CSR) is a duty-grade, factory-assembled upper receiver engineered for hard-use AR-15 platforms. Built around a forged 7075-T6 aluminum upper receiver with M4 feed ramps, this upper features a 16-inch Duty Series barrel chambered in 5.56x45mm NATO. Machined from 4150 CMV steel and finished in Nitride (QPQ) inside and out, the barrel delivers exceptional corrosion resistance, heat tolerance, and extended wear life under high firing tempos.
Enclosing the barrel is Faxon’s 13-inch aluminum free-float handguard featuring a full-length MIL-STD-1913 Picatinny top rail and M-LOK attachment slots along the 3, 6, and 9 o'clock positions for mounting tactical accessories, weapon lights, and forward grips. The mid-length gas system decreases cyclic recoil impulse compared to carbine-length setups, reducing internal bolt carrier group wear while smoothing out system cycling for reliable function across a wide range of factory 5.56 NATO and .223 Remington ammunition.
Each Duty Series upper assembly undergoes factory headspace inspection and quality control checks to guarantee lockup and operational safety right out of the box. Complete with an A2 flash hider pre-installed on standard 1/2x28 muzzle threads, this upper receiver serves as a turnkey upgrade for duty, defense, or competition carbine builds.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct drop-in fitment for any standard mil-spec AR-15/M4 lower receiver assembly. Accepts standard mil-spec Bolt Carrier Groups (BCG) and charging handles.
- Inspect upper receiver internal bore and feed ramps for ambient dust or shipping oil prior to staging.
- Apply a thin coat of quality synthetic weapon grease or oil to the bolt carrier group friction rails and insert BCG and charging handle into the upper receiver.
- Align the upper receiver pivot and takedown lug holes with your assembled AR-15 lower receiver.
- Push the lower receiver front pivot pin and rear takedown pin fully into the locked position.
- Perform a dry cycle test: rack the action, lock the bolt rearward, and release to verify proper feed ramps and chamber alignment.
Key Features
- 4150 CMV Nitride Barrel: 16-inch 5.56 NATO barrel with QPQ Nitride finish for superior heat, erosion, and wear resistance.
- Mid-Length Gas System: Smooths out cycling impulse, reduces carrier velocity, and minimizes internal receiver component wear.
- 13" M-LOK Free-Float Rail: Aluminum handguard provides continuous top Picatinny rail and M-LOK mounting slots for accessories.
- 7075-T6 Forged Upper Receiver: MIL-SPEC forged upper featuring M4 feed ramps, forward assist, and ejection port cover.
- 1/2x28 Muzzle Thread Standard: Fitted with an A2 Flash Hider for standard muzzle device compatibility and suppressor adapter upgrades.
- Factory Assembled & Headspaced: Built to exacting manufacturer tolerances to ensure immediate field reliability out of the box.
Product Specifications
- Brand: Faxon Firearms
- Model/Series: Duty Series 16" 5.56 Complete Upper Receiver
- MPN / SKU: FXURGD55616SA13CSR
- UPC: 810209950675
- Caliber: 5.56x45mm NATO / .223 Remington
- Barrel Length: 16 Inches
- Gas System Length: Mid-Length
- Handguard Length / Type: 13 Inch M-LOK Free-Float Rail
- Barrel Material / Finish: 4150 CMV / QPQ Nitride
- Receiver Material / Finish: 7075-T6 Aluminum / Type III Hardcoat Anodized
- Muzzle Thread: 1/2x28 TPI
- Country of Origin: USA
