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Are slims needed to properly time barrel nut? — 2 Answers

by Tom Bates, from DE, United States Asked on October 3, 2019

Name Radical Firearms M-LOK Slim Rail System (FCR) (4.4)
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A
Answered by Ethan C., Gear Expert, from IL, United States, on October 18, 2019

Yes, you would need to shim the barrel nut for proper timing.

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A
Answered by Tom Bates, member, from DE, United States, on October 21, 2019

Shims are not needed. Gas tube goes over the top of the nut. There is no need for timing barrel nut.

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Last updated 2025-11-12 UTC.