I have a rebuilt 800HO with the SPX pistons and I'm at 3 season / 5300KM and still have 150PSI per hole.
Its all about the warmup and maintenance schedule really.
Also when I rebuilt it EVERYONE on Dootalk told me its going to "squeak" for sure as my piston to wall tolerance was way below spec...
For the SKS the only proper way to mount a scope is to tap and mount it like they have on the Mosin Nagant.
I have 2 and I have tried the tri rail reciever cover and its not worth the $20. Even after you buy it you have to custom fit it to the riffle so it fits nice and snug, and it becomes a...
If you look up on the left side of the sled above the secondary you should see a small pig tail with a relay on it.
Thats the one you need to replace...
Part number is 515176175