Head Down Cornerstone .223 Wylde AR Pistol - M-LOK - 10.5"

Manufactured by Head Down Firearms
Manufactured by Head Down Firearms
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NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.

Handguns are regulated by the ATF have restrictions and requirements:
•Your Entire Order will ship only to a Federal Firearm License holder
•Current Processing Time can be 14 to 16 days •Carriers and shipping methods are limited
•A copy of your order/invoice as well as the current FFL License for your local dealer must be emailed to ffl@primaryarms.



“Entry Level” doesn’t have to mean ‘cheap’ or ‘low quality’ and the Cornerstone Series by Head Down Firearms is the quality ‘first’ you’ve been searching for. The Cornerstone is built to last while offering a handy, reliable, and easy-to-shoot platform to act as the foundation of your shooting experience. Every Cornerstone Series rifle is backed by a guarantee of 1 MOA accuracy or better (with decent ammunition), as well as a transferable lifetime warranty.


  • High-strength forged receivers
  • ALG Defense QMS MIL-SPEC Trigger
  • M16 Bolt Carrier Group with Nitride finish
  • 10.5” 41V50 Chrome Moly Vanadium barrel with black nitride finish
  • .223 Wylde chamber accepts both 5.56 NATO and .223 Remington ammunition
  • 1:8 twist rate stabilizes most common grain weights
  • Reliable carbine gas system
  • 9” Head Down M-LOK free float handguard
  • Radian Raptor ambidextrous charging handle
  • Heavy carbine buffer
  • Mission First Tactical Engage pistol grip
  • SBA3 arm brace

The Cornerstone ships from the factory ready to roll. Where many manufacturers are content to supply shooters with cheap A2 pistol grips the Cornerstone comes equipped with high quality and ergonomic furniture from Mission First Tactical that will make shooting easier and more comfortable. Instead of a gritty, rough, parts kit trigger, Head Down have opted for the QMS from ALG Defense, offering a clean, crisp, and repeatable single stage pull you can rely on. The 15” free float handguard provides plenty of room for lights, grips, and other accessories, while also providing shooters of any size to comfortably handle the rifle. Add in a reliable carbine gas system balanced by a heavy carbine buffer to help keep your muzzle on target. Whether the Cornerstone is your first rifle or your fiftieth, it’s the perfect start (or addition) to your collection.
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Barrel CoatingSalt Bath Nitride
Barrel ContourMedium
Barrel Length10.5
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandHead Down Firearms
Caliber Gauge.223 Wylde
Gas System LengthCarbine
Gas System TypeDirect Impingement
Handguard9 in M-LOK Rail
Muzzle DeviceRugged R3 QD Mount Flash Hider
Thread Pattern1/2 X 28
Twist Rate1:8

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