Like @Vollgas said, surely it would just be easier to reset your character rather than an alt?
Just make an NPC option with a few more hoops to jump through to make sure no one does it by accident (we are all stupid)
This might sound so basic, however, have you got any other Gmod addons installed?
Some addons can really fuck about with each other!
If you do, uninstall all apart from PERP content and give it a go.
Can’t sell guns at market stalls
7.7 Sale of Offensive Weapons
A person does not commit an offence under articles 7.4 or 7.5 if the offensive weapon in question is stored or displayed within a property defined by the banks of Paralake City as being a Shop or Business. In addition to this, the...