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Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System
As Low As $37.95 Save Up to 32%
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FireteamMichael's Review of Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System

While I've always opted for standard "mil-spec" parts, (if good enough for DoD, good enough for me!) however on a recent build, thought about trying something different opposed to staking another castle nut. Was going to try another company's "ratcheting" design, but ended up going with this; and glad I did! Very well thought out design, the 'taper fit' isn't going to loosen up and looks pretty slick too. Machined and finished perfectly, no imperfections. Price was great as well!
Pros:
  • Price
  • Well machined and fit perfect
  • Obvious attention to detail
  • No staking, locks up tight, yet can be removed again
  • QD sling swivel mount
Cons:
  • None
Best Used for:
  • AR15 receiver extensions
  • Giving your "evil black rifle" some customization
Would Recommend: Yes
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Last updated 2025-11-12 UTC.