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Questions & Answers
What is the difference between this one and the non Omega K2 castle nut Expert Answer

Please email us at techsales@opticsplanet.com regarding your question.

by Hunter, Gear Expert, October 9, 2023
Will it work with another castle that’s fit for mil spec. Expert Answer

Yes they can be used.

by Brandon B, Gear Expert, September 8, 2021
Customer Reviews
Helpful Positive Review
Game Changer by Silversheeepdog, Verified Owner, December 29, 2021
I stumbled on this during a build I was working on a builld. While I must admit the cost is substantially more than a regular castle nut. It's definitely worth the investment. It looks great!! Not to mention, the functionality is unsurpassed.
5/5 found this helpful
Helpful Positive Review
Works as Advertised.....but is Fragile by RJ, Verified Owner, December 8, 2023
I like the design and it works fine and looks good. HOWEVER, the castle nut is light and fragile. I felt like I was doing surgery when installing it. If you overtighten or make a wrong move it will bend. I read in the description that they also make ...
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1/1 found this helpful
Helpful Positive Review
Fortis knows their stuff by Infernal, Verified Owner, December 12, 2024
I’ve bought 3 of these, they’re very user friendly both torquing them on and removing them is a breeze, and if you’re someone who changes the parts on their gun like a girl changes clothes, than this thing is perfect for you.
1/1 found this helpful
Helpful Positive Review
Fantastic products by Mik, Verified Owner, April 11, 2024
K1 is tapered castle nut version and K2 is lever lock version. Both are fantastic and negate the necessity for staking castle nuts and allow for easier removal when necessary. Make sure you torque correctly and they will serve you indefinitely. Addi...
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1/1 found this helpful
Helpful Positive Review
Way way easier by Fatnipples, May 26, 2022
This is so much better than the ole regular castle nut and plate. Even the take down spring went in easier for some reason. Looks great just a bit of color to match the other accessories. Will be buying again
1/1 found this helpful
Helpful Positive Review
brilliant execution by Jason M, Verified Owner, May 6, 2022
Blown away by this thing. Very easy to install. Just used it for a build with a Gearhead Works Mod 2 brace/buffer tube. It Locks up well via ratcheting device that is in the end plate. It also looks pretty cool. Highly recommended.
1/1 found this helpful
Read All 21 Reviews

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Product Info for Fortis Manufacturing AR-15 LE Omega Clip Castle Nut/End Plate K2 System

When designing our new Lightweight Enhanced (LE) Castle Nut & End Plate System, we came up with two systems that virtually eliminates the risk of your castle nut ever backing out. With our two lockdown systems (K1 & K2), we've engineered a solution to install the castle nut onto the end plate that is not only robust, but also stands true to our brand of innovation and ingenuity. The K2 system utilizes a c-clip design that seats itself through a designed slot on the bottom of the end plate and into corresponding cutouts on the castle nut. This ultra precision fit allows the castle nut to seat itself into place without the need of staking the end plate. No ratcheting, no set screws, no backing out and no failures. All of these features at only .55 oz / 15.6 grams!image

Specifications for Fortis Manufacturing AR-15 LE Omega Clip Castle Nut/End Plate K2 System:

Manufacturer: Fortis Manufacturing
Gun Model: AR-15
Condition: New

Features of Fortis Manufacturing AR-15 LE Omega Clip Castle Nut/End Plate K2 System:

  • Lightweight design at only .55 oz / 15.6 grams total
  • Castle nut is offered in either 7075 aluminum or 4140 steel
  • Quick Detach Socket - 360 rotational locking interface
  • No set screws or ratcheting system

Package Contents:

  • Fortis Manufacturing AR-15 LE Omega Clip Castle Nut/End Plate K2 System

Fortis Manufacturing AR-15 LE Omega Clip Castle Nut/End Plate K2 System Orderable Models

List of Orderable Models

  • Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Omega Clip, K2 Lockdown, Black/Gold, LE-BLK-K2-GOLD , MPN: LE-BLK-K2-GOLD , UPC: 850015927157 , Code: 2GN-CAN-LEK2-LE-BLK-K2-GOLD
  • Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Omega Clip, K2 Lockdown, Black, LE-BLK-K2-4140BLK , MPN: LE-BLK-K2-4140BLK , UPC: 855476008261 , Code: 2GN-CAN-LEK2-LE-BLK-K2-4140BLK

Fortis Manufacturing AR-15 LE Omega Clip Castle Nut/End Plate K2 System Unavailable & Discontinued Models

List of Unorderable Models

  • USED Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Omega Clip, K2 Lockdown, Black, LE-BLK-K2-4140BLK, EDEMO1, Used, Condition Fair , MPN: LE-BLK-K2-4140BLK-EDEMO1 , Code: 2GN-CAN-LEK2-LE-BLK-K2-4140BLK-EDEMO1
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Last updated 2026-09-03 UTC.