Q&A for CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly

CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly

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Mkry, member, from MO, United States, asked on December 03, 2021

Is this barrel dimpled?

Expert Answer

Answered by Ethan, Gear Expert, from IL, United States, on March 09, 2022

The CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly does not have a dimpled barrel. This barrel has a 0.750" gas journal and utilizes M4 feed ramps. It is machined from 4140 chrome moly steel with a nitride finish.

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YS, member, from IN, United States, asked on July 19, 2021

What is the gas system length on the 12.5”

Expert Answer

Answered by Armando R., Gear Expert, from IL, United States, on March 30, 2022

The 12.5" under MPN:30D8A0A is a pistol length gas system barrel.

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newby, member, from WA, United States, asked on August 31, 2020

Is the 12.5 inch barrel a carbine length gas tube?

Expert Answer

Answered by Armando R., Gear Expert, from IL, United States, on March 30, 2022

The 12.5" under MPN:30D8A0A is a pistol length gas system barrel.

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Jan Escamis, member, from SC, United States, asked on January 19, 2023

I purchased this barrel. I was wondering the description says 416SS ( 416 stainless steel)but its say material is 4140 CMV?

Expert Answer

Answered by Hunter, Gear Expert, from OH, United States, on June 21, 2023

The CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly models have different metal options. So the metal of the barrel will vary depending on the model you choose. Please email us at techsales@opticsplanet.com for more information.

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Bryson, member, from NC, United States, asked on January 06, 2023

Would the 12.5 inch barrel fit on a psa 300blk? I currently have a 7.5 inch barrel and would like to switch to a longer one for more rail space.

Expert Answer

Answered by Ethan, Gear Expert, from IL, United States, on February 07, 2023

Yes, the CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly is compatible with Milspec AR15 upper receivers.

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Swagger, member, from WA, United States, asked on July 22, 2022

what gas block diameter is right for 12.5inches barrel？

Expert Answer

Answered by Ethan, Gear Expert, from IL, United States, on July 26, 2022

The 12.5" CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly will fit a 0.750" gas block, and features a pistol length gas system.

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Jcv, member, from CT, United States, asked on March 14, 2022

Is there a definite gas length for the 12.5" barrel? There's one answer says carbine the other says pistol.

Expert Answer

Answered by Hunter, Gear Expert, from OH, United States, on April 22, 2022

The CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly 12.5" model uses a pistol length gas system.

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Matt, guest, from CA, United States, asked on February 28, 2022

What size buffer is needed with this barrel?

Expert Answer

Answered by Hunter, Gear Expert, from OH, United States, on March 14, 2022

The buffer you need will depend on what length CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly you get. However, I recommend using either an H2 or H3 Buffer.

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TX Roadrunner, member, from TX, United States, asked on January 30, 2022

Can I swap out my M&P 15 16” 5.56/.223 barrel for this 16” .300 ACC barrel?

Expert Answer

Answered by Hunter, Gear Expert, from OH, United States, on February 11, 2022

Yes, theoretically you could use the CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly in a Smith and Wesson M&P 15. I recommend you take your rifle to a gunsmith to ensure its done properly, if you choose to swap out barrels.

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Bill, member, from IN, United States, asked on November 23, 2020

All of the descriptions say 16” barrel, but the package contents says 8”. Just wondering which is it?

Expert Answer

Answered by Brandon B, Gear Expert, from IL, United States, on August 26, 2021

This item comes in the following sizes:
8 in
(1 item)
12.5 in
(1 item)
16.1 in
(3 items)

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Q&A for CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly — 14 Questions & 18 Answers