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Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System
As Low As $37.95 Save Up to 37%
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Nick's Review of Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System

I've always just ran mil spec castle nuts and end plates and figured I'd try something different. Glad that I did. The quality of the machining is excellent and it gives a nice solid lockup for a QD sling. Couldn't be easier to install. Not that milspec ones are hard but these can pretty much be done by hand, although I would recommend about 1/3 of a turn more with a castle nut wrench. To top it off they look great too. I've switched all my AR style rifles over to these.
Pros:
  • Solid, QD attachment, easy install, no need to stake, lightweight, and they look great.
Cons:
  • None
Best Used for:
  • Anything that uses a buffer tube (receiver extension)
Would Recommend: Yes
7 of 7 found the following review helpful.
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Last updated 2026-06-19 UTC.