Spare piston 186 muggy

Want to carry a spare piston for the mugello 186 I'm taking to Adria.
Seeing as it's just a get me home thing would a KAC or other standard (ie cheap) type 64mm piston work okay or does it have to be an expensive mugello one?
Chances are that the barrel will be damaged if the piston goes anyway so don't want to waste too much money.
Seeing as it's just a get me home thing would a KAC or other standard (ie cheap) type 64mm piston work okay or does it have to be an expensive mugello one?
Chances are that the barrel will be damaged if the piston goes anyway so don't want to waste too much money.