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Hi Zach, Yes it is Mil-Spec-- SPECS--Anderson RF85 16 300 Blackout Complete Upper - M4 contour barrel 1-7 twist - Forged Upper Receiver - Anderson AM-66-FF-MGSL16-8.75 free float - Anderson Low Pro Gas Block - Knight Stalker Flash Hider - 1 long rail and 1 short rail - Standard Charging Handle - Bolt is made from 9310 steel and coated per mil spec.

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Anderson does not state if it is milspec or not so I would contact them and ask (859) 689-4085 option 1 Monday-Friday 8AM-4:30PM EDT specs RECEIVER: Standard, Anodized Black BARREL: 5.56 NATO, 16″, 1:8, M4 Contour Material & Finish: 4150 Chrome Moly Vanadium, Parkerized MUZZLE DEVICE: A2 Flash Hider GAS SYSTEM: High Rise Aluminum Gas Block and Carbine Length Gas Tube HANDGUARD: A2 Style, Carbine Length, Black BOLT CARRIER GROUP: Standard, M16 Profile Bolt: Mag Phosphate, 9310 Steel, MPI Tested Carrier: Mag Phosphate, 8620 Steel, Staked Gas key CHARGING HANDLE: Standard, Anodized Black TREATMENT: Non RF85

All of Anderson's Uppers are Mil-spec. Anderson Manufacturing AR-15 Mil-Spec Upper Receiver Custom-shop quality without the custom shop price High-strength, 7075 T6 aluminum forged construction Type III, hard-anodized black finish Reliable M4 feed ramps Machined to military specifications and standards Build your ultimate mission-specific AR rifle or carbine around Anderson Manufacturing's AR-15 Mil-Spec Upper Receiver. Anderson Manufacturing delivers custom-shop quality without the custom-shop price. Built from high-strength, forged 7075 T6 aluminum, the receiver ensures reliable performance and outstanding durability. Type III, hard-anodized finish adds extra strength to the receiver walls and enhances abrasion resistance for rugged field use. Comes equipped with reliable M4 feed ramps. Forward-assist and ejection-port cover installed. Machined to military specifications and works with multiple calibers on the AR-15 platform.

what is Milspec from some of the things I have read it cant be mil-spec because its not a 5.56 barrel which is the only AR barrel that has a MILITARY SPECIFACITIONS STANDARD

You may want to call and confirm tomorrow. Anderson Manufacturing-- (859) 689-4085 option 1 --- Monday-Friday 8AM-4:30PM EDT

I would contact Anderson Manufacturing Customer Service for an accurate answer Zachary at (859) 689-4085 option 1 Monday-Friday 8AM-4:30PM EDT

now the Anderson site says coated as per milspec