Tony, I have to say that the polished one I tried was much nicer than mine. Actually the rifle as a whole was nicer to shoot, smoother and with less recoil. I think I was struggling with the pull weight and consequently gripping too tight and pulling shots consistently low and right especially if I was practising quick target acquisition and getting the shot off without hesitation. This may have its origin in an elbow injury, which is the reason when I shoot with a mate of mine we fight over who gets the BSA Ultra and who has to lug the HW77! Have to say, I love the way the Lightning XL handles, and if a bit of time and effort will turn it into something a bit special, then I'll do it just for the satisfaction.
So, seeing as the fiddling has started does anyone have any suggestions for possible modifications? 'O' ring it? Shorten the stroke? I've got a tame machinist and it will make a change from drag race engines