Originally Posted by T 20 Cheers for that, Harvey. So assuming that the HW50 cylinder is 1mm bigger in OD that would account for the difference seen between yours and mine ? image.jpg image.jpg All the best Mick I was under the impression that the HW50 (both m & s versions) had the same cylinder size (26mm seal dia) Yours and mine look the same if you look at where the counterbore on the breech intersects the diameter of the cylinder.
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