Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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8.5" 300 Blackout Tactical AR15 Quad Rail Upper
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Original Price $329.99
Your Price $299.99
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A hard hitting pistol upper chambered in 300 blackout. Perfect for keeping locked and loaded as a close quarters pistol/SBR or hunting coyotes in the woods. Capable of running supersonic ammunition or subsonic ammo (AR lower buffer spring may need to be tuned for load). Complete with a Tactical Quad rail to attach an angled foregrip, flashlight and other accessories.

AR15 300blk Barreled 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
  • T-Marked upper receiver
  • Chrome Moly 4150 High End Steel Barrel
  • Black Melonited Finish
  • Chambered in 300 Blackout
  • 8.5" HBAR Profile barrel with M4 Extension
  • 1/8 Barrel Twist
  • .750" diameter at gas block
  • 5/8x24 threaded muzzle/barrel
  • Low profile gas block
  • Barrel dimpled to secure gas block
  • Pistol length gas system
  • A2 flash hider
  • Carbine length Tactical Quad Rail WITHOUT Endcap
  • 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. Due to high order volume and build to order production, shipping time is currently running 3 to 4 weeks.

You are responsible for knowing your state laws regarding barrel lengths, pistol, Short barreled rife restrictions. 20% restocking fees 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