I take it's a single shot built with the action and barrel in one piece. The action is a Francotte one and the rifle was made by Vickers whilst they had their factory in Westminster, London England. As it's a mark one it should not have the cocking indicator that the marks 2 had which is on the rightside of the breechblock and the rifle was available in several styles, mostly for target shooting, although they did make a sporting version with teh rear sight on the barrel which is adjustable but a screw operated wedge and is marked 25, 50, 100, 200 yards. if I remember correctly. I sold mine about a month ago.