? Norinco Gas Piston Sticking
I am normally in the Mini 14 section here, but I recently picked up a Norinco SKS, and I think I have a problem with the gas system.
I haven't tried to fire it yet, but decided to tear it down and inspect everything before firing. It is now totally clean of all cosmoline, and everything looks good to go except for the gas tube/piston.
Here is what I found: It seems to me that the gas piston should work back to where the top of the piston would be back beyond the two opposite vent holes in the gas tube. Is that a correct assumption? ... Just sliding it by hand, the piston in this rifle doesn't go back nearly that far. It will move just over an inch backwards, and then stops dead. I cleaned and polished the inside of the gas tube to where it actually shines, and then checked the piston for burs. It all looks good to me, but still won't move any furthur back than what I described.
Maybe I should take it to a machine shop and have them burnish the inside of the tube? ... Maybe buy a new tube? ... Info or suggestions?