Beautful little rifle B.S.A. .Stutzen carbine – approx 20 inch barrel – one of the last from the factory circa 1980 estimated.

Double trigger – first trigger back to front – so push on it – and your trigger resets to a hair trigger.
More photos here https://drive.google.com/drive/folders/1UBmJrzWaL7dAQCFSYHp30z-BLgjV1UO-?usp=drive_link
Bore is bright and virtually unused.