Sks gas tube rail - NcStar SKS Gas Tube Scope Mount w/ Side Rails

It is very stable and seems to work well. It did take a good bit of fitting to get it on. I had to loosen all the screws and then adjust it in order to line up the gas tube properly but once I got it on I was very happy with it. I mounted a Vortex Crossfire 2-7x Scout Scope on it and it works perfectly. It gives the appropriate amount of eye relief for that scope, not sure about others. I will have to see if it holds zero after shooting a lot more rounds through it but it seems very stable and secure, far better than the previous scope mount I had.