Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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16" 5.56mm 1/7 Socom GI Barrel Nut Builder Upper (No Handguard)
Return To 5.56/223 AR-15 Upper Assembly | Proceed To Cart
Original Price $239.99
Your Price $199.99
This product is not available for purchase.
Want to do a custom AR15 build? Start with the best parts out there, a test fired Hardened Arms barreled upper so you know your starting things off right! With a socom profile barrel we got rid of the grenade launcher cutout adding rigidity and increased accuracy. Our barrels are machined from 4150CMV Mil-B spec steel and treated with a Melonite/QPQ finish meaning this upper will be as accurate as it is good looking and will last for years to come.

AR-15 Upper Builder 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
  • Mil-Spec GI Barrel nut installed


Fits any mil-spec AR15 lower receiver.

*This sale upper is NOT eligible for the Scorpion rail upgrade. Upper ships in OEM packaging.

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, pistol and short barreled rifle restrictions. 20% restocking fees if you cancel any time after you order or 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