Conventional AR-15 receiver-extension hardware with a standard end plate and stakable castle nut.

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White Label Armory End Plate Kit - Mil Spec Castle Nut Black
The White Label Armory kit is the plain mil-spec choice this slot was missing. It supplies a standard black end plate and castle nut for an AR-15 carbine receiver extension, without adding a sling socket or proprietary locking system.
Add the White Label Armory Mil-Spec Castle Nut and End Plate Kit to your build and see how it enhances your platform.