Great for the price. - NcStar SKS Gas Tube Scope Mount w/ Side Rails

Compared to other optics mounts, this was by far the cheapest I found for an SKS. Depending on the manufacturer, it might drop right in, or you might have to file a few thousandths off. This is explained and shown very well in the directions, and goes quickly if you have an angle grinder, or access to one. I had to adjust the screws on top as I put an aftermarket stock on the rifle, but after loosening everything, and tightening them back down one positioned correctly, it looks great and is very sturdy. $25 and a little bit of elbow grease, definitely worth it.