Hi...have a leaking huntsman pc (leak from filll port ONLY).stripped it to separate barrel from the rest of the rifle.the fill probe main piston o ring was sliced through..will change that.am also keen to change the valve body o rings ie for the front valve body as also the rear valve housing.see the att photos.i see a dowel pin on the air tube..is this also to be removed alongwith 2 flush screws above it on both sides?.also do i also have remove the safety catch group to aceess the rear valve housing where there are o rings..also do i replace the visible o rings like the transfer port o ring..since the rifle is 2011 make and frankly never serviced.pl help
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