I found my gun to be very accurate to 20 yards but accuracy dropped off after this. I was unable to get the back block off the gun and did not want to damage it, (I could see the bolt bending) so I reverted to the original instructions for fettling the leather piston washer...ie tip some oil down the chamber and stand upright in a warm cupboard. After a few oily shots, the gun settled down to 6 ft/lbs or so with very little MV variation. Could cut a 1/2 inch group at 10m with the open sights. Not bad for £25 and I would not sell it. Shame I could not get to the innards.

Mike95