Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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16" 300 blackout Melonited 15" HD Quad Rail upper
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Original Price $359.99
Your Price $279.99
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A 300 blackout 16" rifle upper with a pistol length gas system for all your ammo weight needs. Capable of accurate long range hog hunts in the flat lands of Texas with super sonics to clearing a house with 220gr subs.

AR15 300blk Pistol Upper Receiver 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
  • 4150 CMV Steel High End Barrel
  • 1/8 Barrel Twist
  • Chambered in 300 blackout
  • 16" HBAR Profile barrel with M4 Extension
  • .750" diameter at gas block
  • 5/8x24 threaded muzzle/barrel
  • Low profile gas block
  • Barrel dimpled to secure gas block
  • Pistol length gas system (allows better cycling of all types of ammo)
  • A2 flash hider
  • 15" HD  Quad Rail (end cap not available)
  • 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 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