Is this even legal?

Yes. This is perfectly legal and above board. It's an Olympic sport. In fact, it's the oldest sport in the modern olympics, the largest sport in the games and always the first medal given out. Target shooting as a sport takes place in over one hundred and fifty countries world-wide. And it has been a sport in Ireland for quite some time - the earliest record we have of target shooting in Ireland dates to a target shooting competition in Trinity College in 1840.