The Strike Industries Multi-Function QD End Plate and Anti-Rotation Castle Nut (brand part number SI-AR-UL-MFEP&ACN-FDE) updates the often-neglected castle nut and end plate system on an AR-15 buffer tube. Instead of peening the end plate to secure the castle nut the way a traditional setup does, Strike Industries uses a set screw, so the system can be rebuilt or upgraded again later without damaging the parts. The reversible end plate offers three integral sling mounting options in one part: a traditional sling loop, a loop for hook-style attachments, and a QD socket, giving the shooter flexibility to run whichever sling attachment they prefer. This model is finished in flat dark earth.

Key Specifications

• Anti-Rotation Castle Nut uses a set screw instead of peening, so it can be rebuilt or upgraded later.
• Reversible End Plate works on either side of the receiver.
• Traditional Sling Loop is built into the plate for a standard sling mount.
• Hook-Style Attachment Loop adds a second mounting option for hook-style slings.
• QD Socket accepts a push-button quick-detach sling swivel.
• Flat Dark Earth Finish matches FDE-themed AR-15 builds.

Frequently Asked Questions

Does this replace my factory castle nut and end plate? Yes, it’s designed to replace both as a matched, upgraded set.

Can I rebuild my stock later without damaging this part? Yes, the set-screw design avoids the peening that makes a traditional castle nut hard to remove.

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

Buy the Strike Industries QD End Plate and Anti-Rotation Castle Nut, Flat Dark Earth

Upgrade your buffer tube retention system with Strike Industries from our rifle parts selection. Order online and we’ll ship it straight to your door from our Lubbock, Texas gun shop.