Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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16" 5.56 1/7 SOCOM 10" HD Quad Rail Upper
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Original Price $289.99
Your Price $159.99
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Socom profiles are the answer, with a lightened profile under the hand guard and a full .750 profile from the gas block to the muzzle device. By getting rid of the grenade launcher cut we are able to add rigidity to the barrel and increase accuracy. Barrel machined from 4150CMV Mil-B spec steel and treated with a Melonite finish means this upper will be as accurate as it is good looking and will last for years to come.

AR-15 Upper Assembly:
  • Hardened Arms M4 Feed Ramp Flat Top Receiver
  • Black anodized mil-spec finished upper receiver
  • Feed ramps for increased feeding reliability on barrel and upper
  • Laser etched T-Marked upper receiver
  • 5.56 4150CMV Mil-B Spec Steel Barrel
  • Socom profile for increased accuracy
  • 1/7 Barrel Twist
  • Chambered in 5.56 NATO (will also fire .223 ammo)
  • 16" barrel with M4 Extension
  • .750" diameter at gas block
  • 1/2x28 threaded muzzle/barrel
  • Low profile gas block
  • Barrel dimpled to secure gas block
  • Carbine length gas system
  • A2 flash hider
  • HD Quad Rail free float 10" hand guard without end cap


Fits any mil-spec AR15 lower receiver.


Hardened Arms uppers are high end, accurate, head spaced, inspected and test fired prior to shipping. They are built using stringent specs, top quality parts and procedures to ensure maximum reliability and performance.

You are responsible for knowing your state laws regarding barrel lengths, pistols and short barreled rifle restrictions. A 20% restocking fee will apply if you cancel anytime after ordering or if you can not take delivery due to state restriction. Dealer programs are available on our website. Two year warranty against manufacturer defects. Finishes will wear with use, no warranties apply to finish wear.
515 Tucker Ave, Friday Harbor, WA 98250 | sales@hardenedarms.com
Phone: 425-530-0837