Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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16" 5.56 M4 1/9 Melonite 15" HD Quad Rail - WITH BCG and CH
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Original Price $429.99
Your Price $279.99
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Get the longest sight radius possible on a 16" barrel with our new 15" HD quad rail. Built using our  4150CMV barrels produced in house, nitrogen stress relieved and bore scoped to ensure top quality accuracy. This free float upper lends itself to an increase in accuracy by not putting pressure on the barrel and giving you a long base for your bipod and accessories.

Upper Assembly with BCG and Charging Handle:
  • 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
  • 4150CMV 5.56 Nitrogen Stress Relieved Barrel
  • Melonited barrel (Harder and more durable than chrome lining)
  • 1/9 Barrel Twist
  • Chambered in 5.56 NATO (will also fire .223 ammo)
  • 16" M4 Profile 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 15" hand guard
  • Full Auto Profile Melonited BCG
  • Mil spec Charging Handle


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, pistol and short barreled rifle restrictions. A 20% restocking fee will apply if you cancel any time after you order or if you cannot 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.

If ordering multiples please call us for less expensive combined shipping rates.



515 Tucker Ave, Friday Harbor, WA 98250 | sales@hardenedarms.com
Phone: 425-530-0837