- 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.
Barrel Coating: Salt Bath Nitride
Barrel Contour: Medium
Barrel Length: 10.5
Barrel Lining: Salt Bath Nitride
Barrel Material: 41V50 Chrome Moly Vanadium Steel
Brand: Head Down Firearms
Caliber Gauge: .223 Wylde
Gas System Length: Carbine
Gas System Type: Direct Impingement
Handguard: 9 in M-LOK Rail
Muzzle Device: Rugged R3 QD Mount Flash Hider
Thread Pattern: 1/2 X 28
Twist Rate: 1:8

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