The 9millimeter guns are the most common caliber used for concealed carry guns. It’s the most powerful and cheaper than .40 and .45 calibers. And mostly cops have 9mm pocket pistols even mostly law agencies recommend to use 9mm pistols or you can also check 9mm pistol prices here. Sometime you heard this word “smallest 9mm pocket pistols” actually these kind of guns are relatively cheap and small in size and it’s very popular in the US to buy these guns as they provide you complete protection and security.