Original creator of the Pepperbox here. I had originally intended for the only accessories available for the pepperbox to be a different grip, seeing as that’s the only real thing you could attach that would be of any benefit, such as a polymer grip. Pepperboxes aren’t really inducive to any modification, aside from changes in barrel length. But since there’s 6 barrels, any increase in the length could compromise the action that rotates them. Since I never got around to making a grip modification that fits the pepperbox, the accessory slot is currently useless.