I have finally got round to installing a scope and was going to try out the BSA Ultra I purchased from someone some time ago. At first I thought the scope was loose, but no, it is the breach. I can rock the breach from side to side and this also allows movement of the barrel, not a good scenario for getting good accuracy. I can not see any screws attaching the breach to the tube, does anyone have any knowledge on how to tighten down the breach on these guns. I took the stock off and do not see any obvious attachment screws on the underside, they have to be somewhere? Any hints would be greatly appreciated, maybe even a schematic? many thanks, Neil.