Originally Posted by
madcarlos
As above, Me to bought my 77k just over 30 odd years ago and fitted the maximiser kit, I used to shoot very often back then and did often strip and clean the 77 quite often, From memory I'm sure I fitted 3 maximiser kits back in the early years and replaced the ox springs quite often back then, As above no crono to test it until I found a local shop in aberdare who tested my then hw 77 and hw 80 with results that are not quite accepted these days, So unless the ox spring has changed it is most likely to need cutting to be under legal limit, Would make more sense to buy a spring or kit that would only need adding or removing washers /spacers.