Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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16" 300 Blackout Melonited 10" Tactical Quad Rail AR15 Upper - Pistol Length Gas System
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Original Price $329.99
Your Price $249.99
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. A 10" quad rail helps keep the weight down and provides for mounting options for bipods, lasers and even night vision scopes.

Click here to Upgrade your receiver to the Limited Edition Upper Receiver

AR15 300blk Rifle 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
  • 4150CMV .300 Blackout Barrel Machined In House
  • Black Nitride Finish
  • Chambered in .300 Blackout
  • .093" gas port hole (allows better cycling of subsonic ammunition)
  • 16" HBAR Profile barrel with M4 Extension
  • 1/8 Barrel twist
  • .750" barrel 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 subsonic ammunition)
  • A2 flash hider
  • Tactical 10" free float quad rail 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, 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.

Due to high order volume shipping can take up to 4 weeks.
*Thunderbeast Arms" products are NOT compatible with our products, and will void your warranty.

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