system
Given the following post, respond as if you're commenting on Reddit:
human
[Outlaw Star] Questions about Caster guns.

Do I need a special skill set to use those guns? Is there more than one model of gun? Could I make the shells in my basement? How hard would it be to make fake shells for a quick buck?
gpt
>During the Fixed Star Era, Caster shells were created by wizards who used mana as their primary source of power. When mana began grow scarce, the wizards attempt to harness its power within specialized cartriges. However, caster shells only proved to be a temporary solution to a persisting problem. Caster shells and their weapons eventually fell to wayside and became antiques in the Toward Stars Era.

These things are antiques over a hundred years old harnessing the already disappearing magics of a planet and loading them into shells. 

Caster guns = Spell Caster guns

Its literally a magic bullet rated 1-20 on strength. You could try to make fake shells but the people peddling these weapons are not people who you want to have pissed off at you. Unknown whether or not there is a litmus test to discern real from fake but presumably if its magic based there must be some way of an experienced user to be able to tell if its legit or not.