oh right... do the argos/gadget shop type fire different balls then?
yeah they're a lot smaller
TBH the spring ones you can buy in argos and that are legal for use in public (there's NO warning on the box), and they do give you safety glasses to use with them (not that the people around you would have glasses.....). Just...it's a bit thick of him to say you can use .68 cal balls in them...lack of knowledge in general.
If he'd said go and buy an inferno and go give it to the kids to play in the park with; I woulda been seriously concerned then, but it just shows that he hasn't even realised yet that it takes 280fps at least to break a ball, OR, he just wanted to get your mate off his back and fed him some bull to get rid of him which is just as bad...