War Lock Multiple Caliber System

What is the War Lock?

Quite simply, the War Lock replaces the barrel nut on almost any AR-15. Once replaced, it allows the user to remove and install barrels without tools. This modularity allows the AR-15 owner to change out over 90 calibers by switching simple components (typically a barrel, bolt and/or magazine).

Which Multiple Caliber System Do I Need?

AR Ready Series

– Upper receivers and complete barrel assemblies – we’ve done the hard work for you!

AR Retrofit Series

– These kits are for the AR-15 builders out there.

AR Parts Series

– Individual parts and OEM replacements.


WarLock HomeNOTE: Other rifle makers want to sell you a single caliber, or proprietary system. We put the decision making in your hands. You can create the AR-15 that is made for you, without the barriers that come standard from other companies. Every person is different, and we feel that choices should be left to the individual.


 Choose Your Warlock Series Below.