When the gas system fails to cycle, your SKS will only function as a bolt action rifle. Replacing your original gas piston with this high quality model will ensure years of successful performance. Exceeding original specifications, our gas piston is machined from high strength stainless steel. This item is marked as “TAPCO USA” leaving no doubt that it is U.S. made. Counts as 1 U.S. 922r Compliant Part.