That 'credit card gun' is nothing more than free publicity for the gun shop, its a muzzleloader, which means you can only fire it once, and then you have to spend a few
minutes reloading it. VERY IMPRACTICAL!
A little bigger, and alot larger caliber than that credit card gun is the Keltec .380 which is 6+1 rounds that you can put into a bad guy as fast as you can pull the trigger.
