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I just purchased this barrel 18 in. 6mm arc and I can say for a fact it is not a rifle length +2. Going with a +1 rifle length. YMMV 6.5c was a +2 — 2 Answers

by Sgt. Gray Beard, from MI, United States Asked on November 10, 2022

Name Rainier Arms AR UltraMatch MOD2 6mm ARC Rifle Barrel (3.8)
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Answered by Ryan Weddle, member, from VA, United States, on January 14, 2025

Yes, I own the 18" and 22" UltraMatch 6mm Arc barrels. The 18" is rifle+1 gas and the 22" is rifle+2.

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Answered by Ron Phili, member, from CA, United States, on May 05, 2023

If you look in the spec list its listed as 22" for the +2 tube. The 18 will be rifle or rifle + 1 for sure.

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Last updated 2025-11-12 UTC.