The 30 cal AAC can and maybe the Gemtech Sandstorm once? But yeah... cans that are generally too big/unwieldy to run on an AR on a regular basis... we kinda tried them out here and there.
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I think I've only fired one SF can. But it makes sense. My mini can appreciation is based on comparison with full size cans also in 5.56. I've never pro actively swapped out a 30 cal vs. the Mini for gas comparison. I might try it next time Pappabear has the Mini 4 out to shoot.