It is in fact an 853 as bought, I installed the 753 sights and i cant remember where the butt pad came from.🤔 yes I installed the sear adjustment screw, but I can't get it as light as I'd like without the safety becoming non functional. I believe I need to provide more relief on the piece you...
From his post "low Vortex picatinny mounts & UTG adaptor bases" I'm guessing the HW70 has a 11mm rail and you need to adapt that to the picanny base on the sight.
As you can see in the parts diagram there is nothing on the piston end. You can however put a plastic washer in there, just keep it thin, I think mine was .125".
Sorry, couldn't resist. I love that 95 in the 98 stock, I have a 12.25" .22 barrel on it, handles great, I refer to it as my 58. I have another 98 stock I haven't decided what to do with.