Obviously I don't know a lot about double barrels and need a little help please is this a 10 or 12 Ga? I measured the barrels at the end of the gun both .771" at the chamber end .882" ID
It is stamped with a 10 here is a link to pics http://imgur.com/a/WIZS9
Also can anyone tell me what the small set screw is for (see pics)

Last edited by Discus420; 08/17/17 09:32 PM.