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Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System — 7 models

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Questions & Answers
Is a castle nut wrench required to tighten the additional 1/4 turn (over hand tight) as the description states, or is this possible without a wrench? Expert Answer

I recommend using an armorers wrench and following the proper torque and staking requirements.

by Ben, Gear Expert, February 11, 2021
See 1 More Answer
Will this work with Aero Precisions Enhanced Carbine Buffer? I believe the threads are not threaded as far up as a mill spec buffer is. Expert Answer

This should work with the Aero extensions. They should have the same threads.

by Davis N., Gear Expert, February 1, 2021
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review New and improved 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 BEATS MILSPEC by Nick, Verified Owner, February 7, 2022
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 mils...
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5/5 found this helpful
Helpful Positive Review Best end plate you can buy by Pelt, December 10, 2022
All of these tiny parts are so expensive but they sure do make your gun look custom and beautiful. Not to mention adding functionality with a QD hole for a sling. The tapered look is so nice and it makes the end look formed instead of just ending in ...
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1/1 found this helpful
Helpful Positive Review Great Alternative to Standard Castle Nut/Endplate by Justin, April 17, 2019
Very good product. I was looking for something aesthetically different from all the usual QD endplate/castle nut combos Ive used in the past, and the Fortis K1 caught my eye. After receiving it and installing, its clear that its more than just a visu...
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1/1 found this helpful
Helpful Positive Review A well thought out, improved castle nut/end plate design! by FireteamMichael, Verified Owner, September 14, 2019
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 "ratche...
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2/3 found this helpful
Helpful Positive Review Excellent Function by Chris, Verified Owner, February 5, 2020
Used this with an Androcorp buffer tube. Looks great and tensioning mechanism functions well. I had to sand down the locator a bit though and I just about ran out of threads to get it on. Maybe I wasn't using the correct parts but looks and functi...
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1/1 found this helpful
Read All 31 Reviews

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Product Info for Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 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 K1 system features a tapered castle nut that seals itself onto the end plate. This ultra precision snug fit allows the castle nut to seat and seal 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 .59 oz / 16.8 grams!image

No torque wrench required, just tighten about 1/4 turn from hand tight. If using a torque wrench, be sure to only use 15-20 ft lbs - this is much less than ytypical castle nut

WARNING: California`s Proposition 65

Specifications for Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 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: 0.55 oz
Quantity: 1
Condition: New

Features of Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System

  • Lightweight design at only .59 oz / 16.8 grams total
  • Quick Detach Socket - 360 degree rotational locking interface
  • No set screws or ratcheting system

Package Contents:

  • Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System
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Image of Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System 7 models Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System

Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System Orderable Models

List of Orderable Models

Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, ODG Castle Nut, LE-BLK-K1-ODG , MPN: LE-BLK-K1-ODG , UPC: 850015927522 , Code: 2GN-CAN-LEK1-LE-BLK-K1-ODG
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, FDE Castle Nut, LE-BLK-K1-FDE , MPN: LE-BLK-K1-FDE , UPC: 850015927270 , Code: 2GN-CAN-LEK1-LE-BLK-K1-FDE
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black, LE-BLK-K1-BLK , MPN: LE-BLK-K1-BLK , UPC: 855476008247 , Code: 2GN-CAN-LEK1-LE-BLK-K1-BLK
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black/Gold, LE-BLK-K1-GOLD , MPN: LE-BLK-K1-GOLD , UPC: 855476008254 , Code: 2GN-CAN-LEK1-LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, Grey Castle Nut, LE-BLK-K1-GRY , MPN: LE-BLK-K1-GRY , UPC: 850015927188 , Code: 2GN-CAN-LEK1-LE-BLK-K1-GRY
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Red, small, LE-BLK-K1-RED , MPN: LE-BLK-K1-RED , UPC: 855476008759 , Code: 2GN-CAN-LEK1-LE-BLK-K1-RED
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, Blue Castle Nut, LE-BLK-K1-BLU , MPN: LE-BLK-K1-BLU , UPC: 850015927171 , Code: 2GN-CAN-LEK1-LE-BLK-K1-BLU

Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System Unavailable & Discontinued Models

List of Unorderable Models

USED Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black, LE-BLK-K1-BLK, EDEMO5, Used, Condition Good , MPN: LE-BLK-K1-BLK-EDEMO5 , Code: 2GN-CAN-LEK1-LE-BLK-K1-BLK-EDEMO5
Open Box, Dealer Demo, Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, FDE Castle Nut, LE-BLK-K1-FDE , MPN: LE-BLK-K1-FDE-DMO , Code: 2GN-CAN-LEK1-LE-BLK-K1-FDE-DMO
Open Box, Dealer Demo, Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, Blue Castle Nut, LE-BLK-K1-BLU , MPN: LE-BLK-K1-BLU-DMO , Code: 2GN-CAN-LEK1-LE-BLK-K1-BLU-DMO
USED Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black, LE-BLK-K1-BLK, EDEMO3, Used, Condition Like New , MPN: LE-BLK-K1-BLK-EDEMO3 , Code: 2GN-CAN-LEK1-LE-BLK-K1-BLK-EDEMO3
USED Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black/Gold, LE-BLK-K1-GOLD, EDEMO4, Condition Parts Only/Salvage, Defective , MPN: LE-BLK-K1-GOLD-EDEMO4 , Code: 2GN-CAN-LEK1-LE-BLK-K1-GOLD-EDEMO-DF-F
Open Box, Dealer Demo, Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, Grey Castle Nut, LE-BLK-K1-GRY , MPN: LE-BLK-K1-GRY-DMO , Code: 2GN-CAN-LEK1-LE-BLK-K1-GRY-DMO
Open Box, Dealer Demo, Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Red, small, LE-BLK-K1-RED , MPN: LE-BLK-K1-RED-DMO , Code: 2GN-CAN-LEK1-LE-BLK-K1-RED-DMO
01:57
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Blue, Small, LE-BLK-K1-BLU
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, ODG Castle Nut, LE-BLK-K1-ODG
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, FDE, Small, LE-BLK-K1-FDE
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black/Gold, LE-BLK-K1-GOLD
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Gray, Small, LE-BLK-K1-GRY
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Blue, Small, LE-BLK-K1-BLU
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, ODG Castle Nut, LE-BLK-K1-ODG
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, FDE, Small, LE-BLK-K1-FDE
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Gray, Small, LE-BLK-K1-GRY
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
1 of 1 videos
Fortis LE Castle Nut End Plate K1 System Installation
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Blue, Small, LE-BLK-K1-BLU
1 of 22 images
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Blue, Small, LE-BLK-K1-BLU
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, ODG Castle Nut, LE-BLK-K1-ODG
2 of 22 images
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, ODG Castle Nut, LE-BLK-K1-ODG
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, FDE, Small, LE-BLK-K1-FDE
3 of 22 images
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, FDE, Small, LE-BLK-K1-FDE
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
4 of 22 images
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black/Gold, LE-BLK-K1-GOLD
5 of 22 images
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Black/Gold, LE-BLK-K1-GOLD
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Gray, Small, LE-BLK-K1-GRY
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Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Gray, Small, LE-BLK-K1-GRY
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
7 of 22 images
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Blue, Small, LE-BLK-K1-BLU
8 of 22 images
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Blue, Small, LE-BLK-K1-BLU
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, ODG Castle Nut, LE-BLK-K1-ODG
9 of 22 images
Fortis Manufacturing LE Lightweight Enhanced AR15 End Plate System, K1, Tapered, ODG Castle Nut, LE-BLK-K1-ODG
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, FDE, Small, LE-BLK-K1-FDE
10 of 22 images
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, FDE, Small, LE-BLK-K1-FDE
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black LE-BLK-K1-BLK
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
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Fortis Manufacturing LE Lightweight Enhanced Castle Nut/End Plate System, Tapered, K1 Lockdown, Black/Gold LE-BLK-K1-GOLD
Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Gray, Small, LE-BLK-K1-GRY
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Fortis Manufacturing K1 LE LW Enhanced AR15 End PLate System, Castle Nut, Tapered, Gray, Small, LE-BLK-K1-GRY
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
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Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
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Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED
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Fortis Manufacturing Lightweight Enhanced AR15 End Plate w/K1 System Tapered Castle Nut, Red, small, LE-BLK-K1-RED

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For more information go to www.p65warnings.ca.gov

Notification

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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