A buddy has the 5.56 Brevis can for his 10.3" Colt 6945 SBR. It is incredibly light for its internal volume and size. We shot side by side for a couple mags and I could not discern any difference from his and my 11.5" with Specwar K 556 can. I think they are a step in the right direction but I am not a fan of direct thread and they do cost a pretty penny.
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