Quote Originally Posted by Roger Payneicon View Post
I think the HV SC became a standard marking on barrels produced for MkVII ammunition, although I'm not absolutely sure on this & would welcome confirmation. It wouldn't have that elusive 'ER' cypher as it looks as though BSA likely assembled it from NOS parts that were in store when the contract came in. If you look carefully at the butt socket markings the cypher & the '19' of the year date have all been applied together, with the '36' being added later. This is very common on interwar rifles, certainly of BSA mfr. I have a few of their 1930's dated barrelled actions & IIRC they are all marked like so. Waste not want not, I suppose!
Agreed - so any barrel that was modified for the use of MKVII would have been after its introduction in 1915.

The marking was put on to show they had been modified, 'new production' would have incorporated the mods, so, would not be marked.

Why 21 years later would they mark a 'newly made' rifle / sight with the "HV SC"