Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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16" 300 Blackout Stainless 12" Quad Rail - BCG and CH
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Original Price $549
Your Price $399
16" Stainless Steel 300 blackout with a 12" Quad Rail, BCG and Charging Handle! This setup makes the ultimate 30cal AR15 for hunting or just punching really large holes in things. The extended rail allows for a longer sight radius, bipod attachment near the muzzle for added stability and extra rail attachments space. These upper receivers feature a pistol gas system for added reliability and flexibility in ammo selection as the shorter system runs at higher pressures for the some times finicky 300 blackout round. We have a very limited supply of these barrels and they won't last long at these sale prices, get yours while supplies last!

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
  • 416r Stainless Steel .300 Blackout Barrel
  • Chambered in .300 Blackout
  • Pistol Length Gas System
  • 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
  • A2 flash hider
  • Tactical 12" free float quad rail Without end cap
  • Mil-Spec Charging Handle

BCG Specs:
  • Black Melonited coated carrier and bolt
  • Individually MPI Tested
  • Bolt: Carpenter 158 hardened, Shot Peened, and MPI tested.
  • Carrier: 8620 Tool Steel-(M16 full shroud)-Heat Treated, Case Hardened, & Melonited (harder than chrome).
  • Gas Key: Melonite Lined-Grade 8 Hardened Fasteners, Permatex No. 3 sealed, Torqued to 60 in lbs, & Mil-Spec Staked
  • Cam Pin: 4340 Steel-Heat Treated & Phosphated
  • Extractor: Tool steel S7-Heat Treated to 48-53 Rockwell C & Phosphated

Upper fits all 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.

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