I have a Chinese Norinco SKS that I decided to modify by putting on a Tapco SKS intrafuse stock. The Gas tube was going to be a pain to change out so instead I ordered a new Tapco gas tube to go with the stock. However, when I put the gas piston into the Tapco gas tube, it doesn't fit. I tried to find online a tapco gas piston to buy and install, but it looks like they have been discontinued. Has anyone else had this problem? How did you fix it?