PLEASE, please, please, a thousand times, DO NOT let a different makers magazine, backsight or whatever put you off because, as I've said a zillion times, Armourers didn't care what parts they used or re-used. It went back into circulation working. In fact, Armourers that I talk too cannot believe what they're hearing when I tell them what I read about having all the 'correct' parts or questioning them. Listen.......... in the Armourers shop, the parts that are suppled by Ordnance or are on the shelf are ALL the correct parts. So if it's a BSA rifle and it's got a Savage magazine and it works properly, then that's the way it left the Armourers shop.
In this case, the rifle is a real one, the telescope is real but the bits that join the two together are fake