Manufactured to exacting tolerances for optimal performance, this stainless steel gas piston is a necessary upgrade to your weapon. This is an AK/MAK version with a length of 6.25". 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 (SKS6602) will ensure years of successful performance. Exceeding original specifications, their gas piston is machined from high strength stainless steel.