I have the .22Mag Pug. It is well made perhaps too well made (close tolerances). Last time I looked NAA was still saying on their website that the gun will function with all available .22 Mag ammo , when they know that not to be true. Mine came with a slip of paper in the box warning not to use with PMC ammo. After one round, the Winchester ammo I bought with the gun, locked up the cylinder. I called NAA , who said, "Yeah, we've heard that. Try CCI, that's what we use. " CCI works fine as predicted but I wonder if they have a legal department .
Keep mine in my sock drawer and usually it's the one I stick in my front pocket before leaving the house. My advice however is before using one for self defense, make sure it works with your choice of ammo .