Andy, I had a HW77K a few years ago....Actually 19 years ago..How tme flies. It was a good accurate air rifle if a little heavy. The record trigger unit was superb. I wish I still had it. Sandy
Polishing the piston tube looks nice, and makes you feel like a job well done. The way a newly washed car drives better. It actually does nothing to improve the shot cycle. This tube free floats within the breach tube, pivoting at the point the piston is attached. The breach tube I/D is 0.4mm larger than the piston tubes O/D. Because of the way the sear engages, you get some rubbing of the piston tube at the opposite end to the piston. That may be worth polishing out, as is the external diameter of the breach tube. As you mention in one of your replies it just looks nice. Hws are geared up for around 15ft/lb for the European market. Through my experience they all react well to being short stroked. Faster lock time and less hold sensitive.
Pistons on hw 77s are probably best done by hand hours of laboriously polishing them with simachrome can really make the differences from industrial machines I use a dremal
yes these were the best rifles of there time,i still have one with a thumb hole stock and an original 52 classic there both as accurate as each other and i had great fun shooting them but not for many years now atb
Hi, after polishing and reassembling it, did you notice any improvement in the firing cycle? Have you noticed improvements in accuracy when compared to before too? Greetings from Italy ciao Fabio
@@madamguillotine6819 at the crown ,yes .And at various points along the piston tube .Polishing makes it smoother along with a thin smear of molybdenum disulphide.
That don't even look polished man o man i took my piston to work stuck it in the lathe and used autosol its like glass took 30 seconds .i polished the inside with a tool made from tube ally cut in half and covered with electric tape ,worked well,and my gaffer thought i was working on work stuff My HW77k serial 1002 first four.still,shoots Like it did from new
