The Strike Industries Multi-Function End Plate and Anti-Rotation Castle Nut (brand part number SI-AR-MFEP-ACN) replaces a standard AR-platform end plate and castle nut with a steel set built around three integral sling mounting options. Strike Industries built in a QD sling socket, a traditional sling loop, and a loop for hook-style attachments, so you can run whatever sling hardware you already own without buying an adapter. The castle nut’s anti-rotation design keeps it from backing off under recoil, and the whole set is reversible for mounting flexibility. Finished in black, it’s a practical, do-it-all upgrade for anyone building or refreshing an AR-15 buffer tube setup.

Key Specifications

• Includes a built-in QD sling socket.
• Includes a traditional sling loop.
• Includes a loop for hook-style sling attachments.
• Castle nut uses an anti-rotation design to resist backing off under recoil.
• Reversible for mounting flexibility.
• Machined from steel.
• Finished in black.

Frequently Asked Questions

What sling options does this support? A QD sling socket, a traditional sling loop, and a loop for hook-style attachments.

Will the castle nut back off under recoil? It’s built with an anti-rotation design specifically to resist backing off.

Is this a replacement for both the end plate and castle nut? Yes, it replaces both as a matched set.

Buy the Strike Industries Multi-Function End Plate and Anti-Rotation Castle Nut – Black Steel

Run whatever sling setup you want without hunting for an adapter. Order it through our Strike Industries lineup, part of our AR lower parts selection, from our Lubbock, Texas gun shop as soon as it’s available to ship.