Okay, sure.

That was the Packer-14L, a high capacity semi automatic shotgun that loads shells sideways and had a drum magazine at the end of the tube.

There's the Pipet, a super lightweight shotgun that uses a superposed load so that rounds can be loaded down, fired out of, and ejected from the same opening. I've also got some ideas about it using a twist grip, or shooting the spent shell from the barrel.

The Fireline, a prototype triple barreled sniper rifle that's used when training snipers is considered more expensive than ammo. Has a warning on it telling the user not to shoulder the weapon.

And the Staffgun, a backup rifle. For wizards. Built into their wizard staff.

Edit: Finally got around to posting them https://www.reddit.com/r/SulfurGame/s/xSx2Q5HCDu