This magazine lock kit is designed for the first generation AR-57 upper receiver.  This fixed magazine lock kit allows the operator to remove the top-mounted magazine with the use of a tool. This kit should only be used with 10 round magazines.

Note: This kit is NOT compatible with the new Gen 2 AR-57 upper receiver.

 

 

 

This magazine lock is designed to conform to the law as written in CA Penal Code 978.20(a) which defines: "detachable magazine" means any ammunition feeding device that can be removed readily from the firearm with neither disassembly of the firearm action nor use of a tool being required. "A bullet or ammunition cartridge is considered a tool."