The AAC Evolution can come apart, a little help from a ti-rant piston does help, and the first gen sig sauer Rimfire can is almost completely interchangeable with the evolution, my calipers show them to be the same inside and out. The only issue I see is the sig can has another inside Steel tube that would cause problems and the baffles are 1.280 and 1.264. I have no intention of testing further than that, just thought it was interesting.