A 9mm revolver would be great. If there would be a way to get around having to use moon clips and just load into the cylinder it would be better. I am not sure if most 9mm revolvers would be capable of shooting 380 auto but that would be an added bonus. Obviously not for cost or effectiveness, just for those who have both ammo types and would like to shoot it. Anyway 9mm revolvers need to make a comeback at an affordable, practical cost.