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Customer Reviews
Helpful Positive Review Nice concept, 4 stars because unsure of durability. by Judah, Verified Owner, December 8, 2022
This is a highly fascinating product, my only reservation is the steal feels hollow or soft. Like it could break or bend, no issues yet, but havent stressed tested. Don't get me wrong, it does what it says and may remarkable, but this is my upfront...
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2/6 found this helpful
Helpful Positive Review New way if doing things! 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 Better then expected by Matthew Hartpence, Verified Owner, August 8, 2022
This item works great if you are looking to make your buffer tube install much easier. It looks great and the Quick detach hole is a plus. Definitely an upgrade to the normal milspec. This item works like it should and I would buy again
1/2 found this helpful
Most Recent Reviews Fortis castle nut/end plate by drcmcico, Verified Owner, June 19, 2025
I installed it on my 308 the other day. The way it locks the nut from loosening is awesome. I love the concept and the look it gave my weapon. I will probably only buy these from now on unless something unforeseen happens over time. Initial reaction ...
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Most Recent Reviews fits perfectly by erik, Verified Owner, February 17, 2025
Needed to get this for my ar to match my build and fits perfectly. Lightweight sturdy have put 100 rounds so far and holds up
Most Recent Reviews Nice upgrade by Toby, Verified Owner, December 27, 2024
Very nice upgrade. Locking lever works well. Will be buying more for my other lowers
Read All 16 Reviews
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Product Info for Fortis Manufacturing AR-15 LE Locking Lever Castle Nut/End Plate K2 System

When designing new Lightweight Enhanced (LE) Castle Nut and End Plate System, we came up with two systems that virtually eliminates the risk of ycastle nut ever backing out. With two lockdown systems (K1 and 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 brand of innovation and ingenuity. The K2 system utilizes a locking lever 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 set screws, no backing out and no failures. All of these features at only .53 oz / 15 grams!image

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

Manufacturer: Fortis Manufacturing
Finish: Milspec Anodized
Fabric/Material: 7075-T6 Aircraft Grade Aluminum
Hand: Ambidextrous
Gun Make: AR Platform
Gun Model: AR-15
Weight: 0.53 oz
Quantity: 1
Condition: New

Features of Fortis Manufacturing AR-15 LE Locking Lever Castle Nut/End Plate K2 System

  • Lightweight design at only .53 oz / 15 grams total
  • Quick Detach Socket - 360 degree rotational locking interface
  • No set screws or ratcheting system

Package Contents:

  • Fortis Manufacturing AR-15 LE Locking Lever Castle Nut/End Plate K2 System

Fortis Manufacturing AR-15 LE Locking Lever Castle Nut/End Plate K2 System Orderable Models

List of Orderable Models

Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, Grey Castle Nut, LE-BLK-K2-GRY , MPN: LE-BLK-K2-GRY , UPC: 850015927287 , Code: 2GN-CAN-FOR202-LE-BLK-K2-GRY
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, Red Castle Nut, LE-BLK-K2-RED , MPN: LE-BLK-K2-RED , UPC: 850015927164 , Code: 2GN-CAN-FOR202-LE-BLK-K2-RED
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, Blue Castle Nut, LE-BLK-K2-BLU , MPN: LE-BLK-K2-BLU , UPC: 850015927133 , Code: 2GN-CAN-FOR202-LE-BLK-K2-BLU
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, ODG Castle Nut, LE-BLK-K2-ODG , MPN: LE-BLK-K2-ODG , UPC: 850015927539 , Code: 2GN-CAN-FOR202-LE-BLK-K2-ODG

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

List of Unorderable Models

Open Box, Dealer Demo, Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, Blue Castle Nut, LE-BLK-K2-BLU , MPN: LE-BLK-K2-BLU-DMO , Code: 2GN-CAN-FOR202-LE-BLK-K2-BLU-DMO
Open Box, Dealer Demo, Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, Red Castle Nut, LE-BLK-K2-RED , MPN: LE-BLK-K2-RED-DMO , Code: 2GN-CAN-FOR202-LE-BLK-K2-RED-DMO
USED, Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, Grey Castle Nut, LE-BLK-K2-GRY , MPN: LE-BLK-K2-GRY-EDEMO , Code: 2GN-CAN-FOR202-LE-BLK-K2-GRY-EDEMO-SC-C
USED Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, ODG Castle Nut, LE-BLK-K2-ODG, EDEMO1, Used, Condition Fair , MPN: LE-BLK-K2-ODG-EDEMO1 , Code: 2GN-CAN-FOR202-LE-BLK-K2-ODG-EDEMO1
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, FDE Castle Nut, LE-BLK-K2-FDE , MPN: LE-BLK-K2-FDE , UPC: 850015927140 , Code: 2GN-CAN-FOR202-LE-BLK-K2-FDE
USED Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K2, Locking Lever, Grey Castle Nut, LE-BLK-K2-GRY, EDEMO1, Used, Condition Like New , MPN: LE-BLK-K2-GRY-EDEMO1 , Code: 2GN-CAN-FOR202-LE-BLK-K2-GRY-EDEMO1
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