P08 19x21 or x19?? HELP
 

Just bought a shooter in 9mm, just noticed the barrel says "made in Italy. Is there any chance this is still a 9x19?? How can I tell??

Are you sure it is a 9mm? Maybe 7.65mm Luger instead? Check the bore, more than likely it is 7.65mm.

It's a mish mash of parts and they had a 30 Luger next to it. I'm pretty sure this is 9. It's definitely after market but the barrel is rather short n fat unlike the 30s

The 9mm cartridge headspaces on the mouth of the case.

If the chamber were cut deeper for a 9x21, you would see the cartridge drop deeper into the chamber than it would on a 9x19 chamber.

The Italians specifically prohibited 9x19 chambers in civilian guns so that you could not use the military ammo.

Attempting to fire a 9x19 cartridge in a 9x21 chamber could be a rather dangerous experience, especially if the primer were struck enough to set it off. 2mm of excess headspace would lead to head separations and possible damage. You owe it to yourself to verify this barrel's actual chamber depth.

The way to verify all this for sure is to use a set of headspace gauges. The breech should not close on a field gauge.

Marc

well shoot guys im 99% its 9x21. the round goes in nicely but if you push it it gets very tight. theres no way im going to be able to fine anyone to buy the barrel off this guy. im probably gunna have to meet u with the guy at the next gun show and call him tomorrow about it