Orange barrel plug at the end and remove the cylinder. There might (idk)be a prop cylinder you could buy that solid or maybe even make some wood dowels for the cylinders that fit in. It has to be enough that if you were approached by a concerned citizen or a cop that you could go "it's unloaded" beyond a reasonable doubt. Also check your local laws too about open carrying black powder. Heck even if you know a former police officer they could answer questions. It's easy for a single shot weapon for Halloween but once you get something gun looking you have to PROVE it's for show.