Ncstar sks gas tube simply wrong size - NcStar SKS Gas Tube Scope Mount w/ Side Rails

I bought an NcStar SKS Gas Tube Rail Mount for my SKS, along with hardware for a trigger spring replacement and a new walnut stock. The walnut stock was custom so it took a while. When the product arrived, I inspected it and it looked to be well built and sturdy. Nothing was loose, it was a solid piece. When I went to field strip the SKS, everything worked well in terms of replacement parts EXCEPT this product. The gas piston from my SKS had a diameter that exceeded the inside diameter of the NcStar gas tube by a few thousandths. Is wasn't much, but enough that the end of the piston simply wouldn't fit inside the gas tube. I've seen posts about having to remove paint or materials to make it work, but I don't have the tools nor the inclination to do that. I'm trying to send it back. Do not buy, this product is dimensionally wrong.