I don't really know about BSA making them. However as pointed out others of the English gun trade did. There was an old chap at the British Sporting Rifle Club at Bisley who had an original Lee Speed sporting rife which had a Q/D scope set up. However his was done in such a way that he had two bolts one witht eh cover fitted for use when he didn't want to use the scope and one with no bolt cover for scope use. Sorry I do not have photos and it's been about 15 years now since I saw the rifle.