If the Sig has a fixed barrel, the can should work fine. Some guns, like most Glocks, require an inertial decoupler on the can to cycle. Adding a can by itself significantly changes the mass and moment arm of the barrel assembly. A LID like Gemtech and other can manufacturers offer will enhance cycling. Personally, if it were me, I'd call AAC and talk with Kevin about the SIG and find out what his experience has been.