How would I go about making a custom gun with PAC 3, without using any of the actual weapons?

I’ve been dicking around with PAC 3 for a while now, and I want to make a custom gun without using any of the actual guns in the tool bar. I usually just use an event to make my custom gun when having a certain gun selected, but is there a way I could do it without the actual guns? If that makes any sense.

You can use the command event to make a ‘gun’ with projectiles. But it won’t function like a swep that you can select from the bucket. Pac can’t make entirely new guns for you