So I bought an xs28 in .25, for the price of the gun I'm moderately impressed. Everything seems to built pretty well... Except for the piston! I unwrapped the gun, all excited to shoot it. Cocked it, was really rough and binding. So I fired it once. Tons of power. Very cool.
Then of course, the mandatory disassembly and cleaning process begins.
The first thing I noticed was that trigger assembly likes to fly apart if you don't know what you're up to with it. Little searching and found everything
but then I pull the piston and see the rod is cocked to one side. The rear spring guide is also warped into an 's' shape. So I deduced that when they build the pistons, they crimp the tube to the head. This one went on crooked.
Took it on myself to develop a better piston assembly, with matching rear guide and top hat. I have done a lot of research on what sort of tolerance for spring fit, what I couldn't find though is how much does a spring actually expand once compressed?
Anyway, still learning how to operate this lathe thing. I'm getting there though
I have this crazy idea, concerning the piston body. Get rid of the cocking shoe slot! By turning down the material along where the slot would be, to allow the same cocking stroke clearance for the shoe, it still has a ring to contact on the back end. Not sure if I'll benefit from this or not, my thoughts were to allow the piston to rotate as the spring twists and does it's thing. Also with no slot cut, the body should remain concentric.
The head is to be threaded and screwed into the body. Same thing with the rod. Not really rocket science, but a challenging project for a novice like myself.
Any thoughts on this little project?
I'll update with pics and measurements in a bit.