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Q&A for Alexander Arms AR-15 Barrel - Threaded, 6.5mm Grendel — 16 Questions & 18 Answers

Name Alexander Arms AR-15 Barrel - Threaded, 6.5mm Grendel (3.6)
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Q
Alec, member, from NH, United States, asked on October 04, 2021

Is this barrel made to SAAMI specs?

A
Answered by MELISSA, guest, from VA, United States, on March 10, 2025

the barrel is made to SAAMI specs.

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Q
Jack, member, from PA, United States, asked on September 22, 2020

Is the 20” barrel a type 1 or type 2?

Manufacturer Answer
A
Answered by Alexander Arms, Manufacturer from VA, United States, on January 05, 2023

To rephrase the question: Does Alexander Arms (the developer of the 6.5 Grendel cartridge) chamber their barrels per SAAMI Specification? The answer is that all Alexander Arms manufactured barrels are chambered per SAAMI specification and also with 5/8x24 threaded muzzles. Only barrels chambered to 6.5 Grendel SAAMI specifications can be considered a true 6.5 Grendel. Any chambering that deviates from the SAAMI spec would be considered a wildcat cartridge.

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Q
Alec, member, from NH, United States, asked on October 04, 2021

Is this barrel manufactured to the SAAMI specs for 6.5 grendel

Manufacturer Answer
A
Answered by Alexander Arms, Manufacturer from VA, United States, on January 05, 2023

To rephrase the question: Does Alexander Arms (the developer of the 6.5 Grendel cartridge) chamber their barrels per SAAMI Specification? The answer is that all Alexander Arms manufactured barrels are chambered per SAAMI specification and also with 5/8x24 threaded muzzles. Only barrels chambered to 6.5 Grendel SAAMI specifications can be considered a true 6.5 Grendel. Any chambering that deviates from the SAAMI spec would be considered a wildcat cartridge.

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Q
CBUCKEYES, member, from OH, United States, asked on April 16, 2021

What Length is the gas tube for the 20 inch barrel

Expert Answer
A
Answered by Tom B, Gear Expert, from IL, United States, on September 22, 2021

The 20" barrel is a rifle length and the 18" is mid-length.

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Q
Capt Gus, member, from SC, United States, asked on March 14, 2021

I thought this was 11.5 inch barrel, on here its listed as 11”barrel

Expert Answer
A
Answered by Tom B, Gear Expert, from IL, United States, on September 22, 2021

You are correct, it is 11.5", I will fix the listing.

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Q
Andy, guest, from GA, United States, asked on December 02, 2020

I'm looking for a 24'' 6.5 Grendel barrel

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 23, 2021

Alexander Arms does not offer one.

1 of 1 found the following answer helpful.
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Q
D, guest, from TX, United States, asked on November 20, 2020

Is this for type II?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 23, 2021

Per Alexander Arms regarding their barrels and bolts and the type,

"This product is not what is referred to as a "type 2" bolt. The term "type 2" was created by the firearms community and loosely applies to bolts that correspond to the wildcat cartridge now known as "Grendel II." Because we are the originator and developer of the 6.5 Grendel cartridge, which is now SAAMI-certified, we do not use, sell, stock, or promote the cartridge and corresponding parts of the wildcat "Grendel II" or any other wildcat cartridge. This bolt is a 6.5 Grendel bolt made to fit the barrels of our 6.5 Grendel rifle products and any other rifle products that happen require the same bolt specifications. We are unable to confirm the compatibility of this bolt with any other company's products."

0 of 2 found the following answer helpful.
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Q
sky, member, from OK, United States, asked on October 08, 2020

what size gas block for the 20in Alexander barrel

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 23, 2021

It uses a .875 diameter gas block

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Q
sky, member, from OK, United States, asked on October 03, 2020

it three 9/16 or 5/8 on 20in barrel the deception is rather confusing on these barrels tnx for info will be looking for answers

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 23, 2021

The barrels are threaded 5/8x24

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Q
sky, member, from OK, United States, asked on October 03, 2020

the info is missing , plz what size is gas block & weight is correct for the 20in barrel???

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 23, 2021

These are the only specifications offered by Alexander Arms for the 20 inch model:

6.5 Grendel 20" Barrel (5/8")
Features:

- 20" Stainless steel fluted barrel
- 1/9 twist
- 5/8-24 RH Threading
- .875 Gas block optional below

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Last updated 2025-11-12 UTC.