There's an XML code for this, it goes like this if I recall correctly :
Go to XML -> select weapon (the selector is on the top of the XML tab, and the weapon category should be under parts) -> add column -> on the left side, write "name" no caps no space -> on the right, put the name of the weapon you'd like
Ok thanks @plane634
There's an XML code for this, it goes like this if I recall correctly :
Go to XML -> select weapon (the selector is on the top of the XML tab, and the weapon category should be under parts) -> add column -> on the left side, write "name" no caps no space -> on the right, put the name of the weapon you'd like