No,it is not part of 'The Regulations',however there is an exception,Uzis are only permitted as a sidearm if you have a 'Leet snipor' defense,which you can gain by buying a two tone WELL L96 or JG BAR 10 and not upgrading it for the first 20 skirmishes you attend.
The Regulations state that any new player may only be allowed to own two tone WE pistols until they gain a UKARA license.
Nobody knows why ''they'' made The Regulations. They just exist,and we blidnly follow on our honor as airsofters.