Assuming you're still lucky enough to have an O-ring on your SPAS 12 you may have removed it when taking your SPAS apart and not know where to put it back.  Or you simply may not have an o-ring on your SPAS at all and need to know where it goes.   Check out the following picture:

Where do Orings Go?

Set the o-ring directly in front of the piston on the magazine tube.  Position isn't terribly important as the piston will slide it perfectly in to place.  Having an o-ring will ensure your gas system is properly sealed and aid your SPAS in cycling in semi-auto mode.  Your SPAS should always be shot with a good o-ring installed, and shouldn't need replaced very often if the SPAS is taken care of.

Need an o-ring?  The SPAS 12 Project has always, and will always, provide them for free to owners that need them.

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The SPAS 12 Project LLC 2020

Special thanks to contributors Alexander H.,  Cole C.,  Zach G., Alex G., Paul S., Craige H., Neil Z., Rick J. Mark M., Tom S., Ben O., Taylor S., Joseph D., Anthony D., Steve P. and David B.