I haven't been close enough to check his undercarriage. According to my immediate neighbour he belongs to a house 2 roads over who might be a bricky, so I wouldn't want to just go chopping someone else's cat.
Get where you are coming from, but un nutered cats are a big problem. Lots of cat charities will do the opp for free just for the control of feral cats.
Is it an intact tom? Catch it and get it neutered.