Fortis K1 Enhanced End Plate with Tapered Castle Nut for AR 15

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Lightweight AR-15 Castle Nut and Endplate with Friction Fit

Fortis created the two-piece K1 system to eliminate the risk of the castle nut backing out, while maintaining light weight.  The K1 endplate features quick detach socket for a QD sling swivel, and it installs easily to the receiver with the K1 castle nut.  These two parts end up fitting together with enough friction that they require no staking, set screws, or threadlocker to make sure your buffer tube is secure.

To see how the K1 works, as well as the K2, which uses a locking lever for a true mechanical lock.

Features

  • Lightweight design at only .59 oz / 16.8 grams total
  • Castle nut and end plate are 7075 T6 Aircraft Grade Aluminum
  • Quick Detach Socket – 360º rotational locking interface
  • No set screws or ratcheting system
  • Made in the USA

Specifications

  • Material: 7075-T6 Aluminum
  • Finish: Hardcoat anodized
  • Weight: .59 oz. Total

Products available on this page:

Customer Reviews

Based on 4 reviews
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(3)
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25%
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S
Steve Eickhoff
Fortis Castle Nut

Beautiful machine work and definitely finished off my build. QD slot on the baseplate is a bonus. Liked it so much I got another red one for my other rifle as well.

c
christopher morcillo
King of the castle nuts

Easy to install. Works and looks great

Thank you for your review! We're so glad to hear that our Fortis K1 Enhanced End Plate with Tapered Castle Nut for AR 15 was easy to install and looks great on your rifle. We strive to provide high-quality products for our customers and we're happy to know that you are satisfied with your purchase. Happy shooting!

A
Anthony Ketterman
Easy to Scratch!

Looks nice and works but impossible to install and turn tight with scratches and dings. Had to use Birchwood Aluminum Black to touch up and hide the marks.

h
harvey boggs
Great product

Liked it so much I bought a second one to put on my other ar.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

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