To be honest Bow, the slight movement between the solid axis block type CanadianMk3 (and 4) type backsight slide and leaf shouldn't be noticeable(?) on the target. However, if you have a UK
made Mk3 or 4 backsight fitted, then these sights require a SPACER, pin axis backsight to be fitted too. Without this, the sight can and will move from left to right and vice verca.
As for the horizontal error, we need more info but I'm sure you'd have said if it was the catch that was defective. BUT as I said, the slack between the slide and the leaf doesn't usually notice on the target.
No5 rifle backsight is not calibrated for the No4 rifle barrel trajectory or harmonicsInformation
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