I am cleaning up a Drilling that has been neglected for some time and the owner would like some information on it. It is a 16X16/10.4mm x 2". Actual dimensions of rifle barrel are: bore= 0.411", Groove= 0.426"(@ 1/2" from muzzle), Rim dia= 0.534", Base dia= 0.476" (@.200"), length= 2.070". What would be the proper chambering designation? There is no indication of Maker on this gun that I can locate but perhaps one of you can make an identification from the proof stamps on the barrels.










Other than the serial number these are the only stamps I have found anywhere on this piece. If you would like to see other pictures I have plenty.

John