Head Down Cornerstone Rifle .223 Wylde Mid-Length Rifle M-LOK Handguard - 16"

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.

We are fully staffed and processing orders. Standard orders are shipping in approximately 1 business days or less. FFL orders take approximately 10 business days or less if you can provide us an actively receiving FFL location. Due to high demand, there is a limit of 5 FFL items in a 30 day period.

Items that are regulated by the ATF have restrictions and requirements:
•Your entire order will ship only to a Federal Firearm License holder.
•Current processing time is approximately 14 to 16 days.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.
•If this firearm includes magazines with a capacity higher than 10 rounds it may not be legal in your state. We will review all order prior to shipping and if your state does not allow the included magazines they will be removed.



“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
  • 16” 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
  • Smooth-shooting mid-Length gas system
  • 15” Head Down M-LOK free float handguard
  • Radian Raptor ambidextrous charging handle
  • Heavy carbine buffer
  • Mission First Tactical Engage pistol grip
  • Mission First Tactical Battlelink Minimalist Stock

The Cornerstone ships from the factory ready to roll. Where many manufacturers are content to supply shooters with cheap A2 pistol grips or M4 stocks, 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 soft shooting mid-length 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 Coating
Barrel ContourMedium
Barrel Length16
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandHead Down Firearms
Caliber Gauge.223 Wylde
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard15 in M-LOK Rail
Thread Pattern1/2 X 28
Twist Rate1:8

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