Castle nut and endplate set that locks by ratchet and fits any mil-spec receiver extension.

The PWS Ratchet Lock set supplies both mounting-hardware pieces behind the lower receiver. Its proprietary ratchet secures a mil-spec receiver extension without staking. It remains available for buyers who specifically want that system, while conventional stakable hardware is the default choice.
Add the PWS Ratchet Lock Castle Nut and Endplate Set to your build and see how it enhances your platform.