guppy
Problem is guppy, when legislation is drawn up its not always thought through, so at worst we could have a ban on say "devices powered by compressed gas capable of firing a projectile". Great say the politicians, we have now banned air guns, then when the ban is in force somebody realises it also covers paintball guns and perhaps some tools used by vets, builders etc. which nobody thought about. So we have to tell the powers that be, that paintball markers are generally not used by twats shooting at cats, old ladies and buses.
Surely the main difference here is that a marker fires a projectile which, by it's design, is intended to burst upon impact with any given target, unlike a bb gun /air rifle which projectiles do not burst. Also its intended to be fired at people, unlike a bb gun/air rifle.
What is to stop you firing for example suitably sized plastic pellets from your marker ? Turn up the velocity. Ouch.
Hopefully such legislation wont get introduced, we just have to police ourselves (bit like estate agents, lawyers do in the UK.. oh, maybe not then!)