I've installed three or four SMLE barrels now and each time I've had to redo it several times until I was satisfied with the sight alignment. Seems I'd put it together and everything would look straight & perpendicular but half an hour later I would look again and decide that the barrel was over or under-rotated and the sights tilted just a couple of degrees, then it's back to square one. Peter has described using the backsight pivot axis and front sight protector to align things on the No.4 rifle and I'm wondering if there is a similar accurate method that will work for an SMLE.
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