The B5 Systems End Plate (B5 Systems part no. AEP-1090) is a one-piece steel castle nut end plate with a built-in QD sling socket, finished in a commercial manganese phosphate coating for corrosion resistance. B5 machines it with a limited-rotation design, so once it’s staked to the castle nut it stays in place for the life of the build instead of working loose. It fits all MIL-SPEC receiver extensions, making it a straightforward drop-in for any standard AR buffer tube assembly. The integrated QD socket adds a quick-detach sling mount point without needing a separate adapter.

Key Specifications

• Built with a limited-rotation design so it stays staked in place.
• Machined as a one-piece steel part for long service life.
• Finished in commercial manganese phosphate for corrosion resistance.
• Compatible with all MIL-SPEC receiver extensions.
• Includes a built-in QD sling socket.
• Finished in black to match most AR lower builds.
• Weighs about 0.062 lb, adding negligible weight to the buffer tube.

Frequently Asked Questions

Does this end plate include a QD sling point? Yes, it has a built-in QD sling socket, so no separate adapter is needed.

Will this fit any AR buffer tube? Yes, it’s compatible with all MIL-SPEC receiver extensions.

Buy the B5 Systems QD End Plate

Add a durable, quick-detach sling point to your build with this end plate from B5 Systems in our AR buffer system parts selection. Order it from our Lubbock, Texas gun shop for fast, direct shipping right to your door.