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Q&A for Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System — 11 Questions & 12 Answers

Name Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System (4.7)
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Q
Kyle, member, from WI, United States, asked on February 10, 2021

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
A
Answered by Ben, Gear Expert, from UT, United States, on February 11, 2021

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

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Q
Andy, member, from MN, United States, asked on March 14, 2020

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
A
Answered by Davis N., Gear Expert, from IL, United States, on February 01, 2021

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

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Q
Wolf, member, from GA, United States, asked on January 10, 2023

This fit an AR10?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on March 06, 2023

Yes, the Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System is compatible with AR15, DPMS, and Armalite AR10 pattern receivers.

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Q
James D, member, from AL, United States, asked on July 28, 2022

Would this fit a maxim defense brace/buffer?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on August 01, 2022

The Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System will not work with the Maxim Defense Braces. You will need to use the include castle nut and endplate with those buffer assemblies.

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Q
Nick, member, from MA, United States, asked on January 26, 2022

If this works as well as it's supposed to then what is the purpose of the locking latch on the K2 model?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on February 14, 2022

On Fortis Manufacturing's website they have a video explaining the differences between the Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System and the K2 System. Essentially, they developed the K2 model to give customers an extra locking feature for peace of mind even though the manufacturer claims to have had no failures with the K1 model when installed properly.

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Q
mb, member, from CA, United States, asked on December 28, 2021

cant you mix and match the colors more?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on August 10, 2023

These are currently the only models of the Fortis Manufacturing AR-15 LE Tapered Castle Nut/End Plate K1 System available.

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Q
marty, member, from NY, United States, asked on October 06, 2021

Is the castle nut considered “wide” ? Meaning. Will it cover the threads on my milspec buffer tube?

A
Answered by Nick, member, from MA, United States, on January 26, 2022

It depends on the buffer tube. I have one on an Aero Precision Enhanced buffer tube and it almost completely covers the threads. But all buffer tubes are manufactured a little differently.

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Q
Shaun Burtnett, member, from MS, United States, asked on September 21, 2020

What does it fit Mill spec or commercial buffer tube

Expert Answer
A
Answered by Ben, Gear Expert, from UT, United States, on February 11, 2021

These are recommended for Mil-Spec tubes.

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Q
Bob, member, from DE, United States, asked on July 26, 2020

Does the black/ gold one come with a black AND a gold castle nut like in the picture? Or just a gold one?

Expert Answer
A
Answered by Davis N., Gear Expert, from IL, United States, on February 01, 2021

The Black/Gold item is the black endplate with gold castle nut.

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Q
Devon, guest, from VT, United States, asked on November 21, 2018

How does the QD mount hold up to a hardened steel stud? One would think the aluminum will fatigue or round out over time. Is the QD opening steel?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on September 10, 2019

It should realistically not have any fatigue or rounding issues. The aluminum used in this castle nut/end plate combo is 7075-T6 which is the same material that mil-spec AR-15 upper and lower receivers are made of. I say this because AR lowers/uppers get steel mounted mounted and installed in them with no issue as long as the part is up to snuff in regards to quality control, which Fortis definitely is.

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