I am toying with the idea of ordering a synthetic stock with a colapsable butt for my Yugo 59/66. My reasoning is this. I have a Springfield Standard M1A for my tactical rifle in wooded and open areas. In urban areas it is just too long of a gun. I dont have the money to buy an M-4 and was looking to try to shorten up my sks and make it more of an up close tactical gun. I have heard rumors that once you start upgrading them they have a tendancy to start jamming. That gun has gone bang every time I have pulled the trigger from the day I bought it and I do not want to risk that reliability. In reguards to that rumor I heard that most of the jam problems come from changing out the magazines over to one of those 30 rd high caps and not the stocks. Anyone out there have any experience doing the same thing?