Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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20" 556 Divoted 1/7 Match Grade 556 YHM Rifle Rail w/YHM Gas Block Sight
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This package is the best of the best with a 20" Black Melonited Stainless Steel 5.56mm Match Grade Hand-lapped barrel and rifle length YHM quad rail. A full size 20" barrel allows for higher velocities out of the 5.56mm cartridge and the dimples allow for more surface area for faster cooling. If your looking for every bit of performance you can ring out of an AR15 firing .223/5.56mm ammo this is it!

AR15 20" Predator Series Upper 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
  • Chrome Moly Match Grade Barrel
  • Black Melonited Barrel Finish
  • 20" 5.56mm Nato 1/7 Twist Match Barrel (Hand Lapped)
  • .750" diameter at gas block
  • 1/2x28 threaded muzzle/barrel
  • YHM Flip Up Gas Block
  • Barrel dimpled to secure gas block
  • A2 Flash Hider
  • 12" YHM Hand Guard

Hardened Arms Complete Lower (optional):

Manufactured on state of the art CNC machines to proper mil-spec dimensions. Hard coat anodized for superior durability and finish. Hand inspected and assembled by our gunsmiths with Hardened Arms lower parts kits, Geissele SSA triggers and a Luther MBA-1 buttstock.

Hardened Arms Lower 7075 Forged Aluminum
Hard-Coat Anodized Type 3 Class 2 Hardened Arms LPK (installed)
Geissele SSA Trigger (Two stage 4.5lb) Luther MBA-1 Sniper Stock
Works with all mil-spec AR15 magazines and components

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.

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