This Hellfighter Mod Kit is compatible with AR-15 

How it works:

By changing out your rear take down pin and replacing it with our modified take down pin in combination with a new bolt catch now used as a magazine lock, you will have a completely California Compliant AR. You no longer have to use a Featureless AR solution. Our system will allow you to keep all of your current features, including a pistol grip, a forward grip, and adjustable butt stock. You can even reinstall a mil-spec magazine release. No need for a bullet button.

• Ultra-fast magazine changes
• Easy to install in 30 minutes or less
• Featureless AR components no longer needed
• No need to permanently modify your upper or lower
• No need for bullet button
• Available for any AR-15 or AR-10
• 100% made in the U.S.A.
• Finished in black
• Patent pending