The use of "real guns" on any film or video set is really stupid. All guns on set are rubber, plastic or replicas which are altered to shoot blanks at the most and real ammunition is NEVER found on set as well.
If you are using blank guns, use an "armorer" to regulate them and issue before the sceneand collect them after the scene. If they are rubber or airsoft, let the prop man issue them and collect them. No wearing or handling of the props unless on the set or in rehearsal.