Ross M10 markings

[Terdfergus]

Hopefully the bore is in as good condition as the exterior?

Your bolt may be a substitution as the finish does not at all match that of the barrel and receiver.

I wouldn't worry about it though; Ross apparently believed his bolts were interchangeable as they were rarely serial numbered to the receiver.

Just ensure correct bolt assembly and fire 'at arms length' from a rest the first few times if you have any concerns.

The bore is in great shape, the bolt has the safety rivet installed and shows the correct full inch of exposed bolt sleeve when open, and closes and locks correctly so I have no concerns at all about safely firing it. My only concern is that the action is a bit stiff when pulling back from the locked position when the firing pin isn't cocked, maybe from being non-matching as you mentioned, but I suspect a good cleaning and oiling will help remedy that somewhat.

It probably did go over but could have been withdrawn before they left Salisbury.

I suspect that was likely the case given the metal is in as good a shape as it is, probably sat in storage for a while before being sold into the civilian market.