Steel AR-15/AR-10 end plate with a built-in QD sling socket, sold with a castle nut.
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End Plate Kit - Quick Detach Steel and Castle Nut
This White Label Armory kit pairs a steel end plate that has a built-in QD sling socket with a castle nut. It mounts a carbine receiver extension on a standard AR-15 or AR-10 lower and gives you a push-button swivel point right at the receiver, which works for both single-point and two-point slings.
Both parts are phosphate coated. Torque the castle nut to spec and stake it into the end plate during installation.

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Add the White Label Armory QD Steel End Plate and Castle Nut Kit to your build and see how it enhances your platform.