I had a Norinco in a Tapco T6, where the gas tube cover screwed to the stock. I mounted a Leapers red/green dot optic on the rail and it preformed flawlessly, no movement as the rail is secured to the stock. The best scope/optic mount I have used is the Choate receiver mount. You must square the mount to the receiver, drill and tap four holes, I did mine in 8-40, and screw the mount directly to the side of the receiver. It sells for around $50.00 or so and comes with hardware. You might also try the Leapers SKS Quad Rail System. I got one mounted on the T6, but it takes a little work. You have to file the forend of the stock down and square it, but once you get it mounted it is very secure, does not move, and offers 4 rails with around 46 slots.