possibly traded for a 1903 Ross, help identifying?

[flying pig]

Yes it's pretty much ready. My plan is to shoot it at the Ross shoot next month, being a special occasion and all!

I have put 10 rds of factory PRVI through it already with no pressure signs etc but I do want to enjoy this old girl not destroy her so I better do some measuring.

Thanks a bunch again for the photos of the ejector spring, it was a huge help.