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Q&A for CMMG, Inc 22 LR Barrel Sub-Assembly — 7 Questions & 6 Answers

Name CMMG, Inc 22 LR Barrel Sub-Assembly (4.5)
As Low As $133.99 Save 11%
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Q
M, member, from NC, United States, asked on April 29, 2021

I have the 22lr conversion kit (bcg + mags) could I build a dedicated 22 upper out of this, and use that kit+mags+ barrel collar? Why no gas port?

Expert Answer
A
Answered by Kurt Colbourne, Gear Expert, from IL, United States, on September 16, 2021

This barrel would need the dedicated BCG. Your magazines would still work with this.

https://www.opticsplanet.com/cmmg-bolt-group-22lr-no-magazine.html

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Q
Matt Capasso, member, from PA, United States, asked on March 29, 2025

Can anyone change my mind about a 1-16 twist rate not being optimal for a 4.5” barrel?

A
Answered by Sal Cappuccino, member, from NC, United States, on February 26, 2026

Your long awaited response, if you even care anymore:

If you’re building or rebarreling for a specific goal:
• For plinking, target shooting, or general pistol use with common ammo (CCI Standard, Mini-Mags, etc.) → 1:16 is optimal and reliable.
• For extreme long-range pistol shooting or heavy subsonics → a faster twist (e.g., 1:14 or 1:12) might edge it out in wind or at distance, but that’s niche and often shows minimal gains in short barrels.
• Slower than 1:16 (e.g., 1:17+) is rare and usually not recommended.
Bottom line: Stick with 1:16 for a 4.5” .22 LR barrel unless you have a very specific ammo/load in mind that demands otherwise. It’s the proven, no-fuss choice.

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Q
KJK, member, from FL, United States, asked on April 26, 2022

Is the indicated length of 4.5" an overall length that includes the small rear portion behind the fake feed ramp area that fits into the CMMG collar?

A
Answered by Elevator Engineer, member, from TX, United States, on June 24, 2022

Yes, that that 1.5" (in the feed ramp) is included in the barrel length.

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Q
Bret, guest, from TX, United States, asked on March 07, 2021

Will this barrel work on a smith and wesson M&P 15-22

Expert Answer
A
Answered by Todd, Gear Expert, from IL, United States, on November 05, 2021

No it will not.

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Q
Glocktoys, guest, from IN, United States, asked on November 04, 2020

Do I just need a standard upper with .22 conversion bolt, rails, .22 mag & lower to run this? It uses the cmmg .22 ar15 conversion bolt conversion

Expert Answer
A
Answered by Kurt Colbourne, Gear Expert, from IL, United States, on September 16, 2021

No, the .22 conversion BCG would be incompatible. This barrel would work with the CMMG dedicated BCG and a standard upper receiver.

https://www.opticsplanet.com/cmmg-bolt-group-22lr-no-magazine.html

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Q
Dave, member, from NV, United States, asked on February 21, 2025

So to fit flush with the barrel you would need a 3" handguard?

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Q
agibsonk, guest, from VT, United States, asked on July 25, 2024

Will this 4.5” cmmg barrel fit and fit in and work with the bolt carrier in a tippmann m4 22

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Last updated 2025-11-12 UTC.