@Chimi_Chuang_Tzu It happens rarely. The IMPORTANT thing is to recognize this malfunction, as an operator, and know how to clear it. Using cheap ammunition is the culprit. It can be Very damaging. Basically, your firearm will explode/shatter. You will probably have an open flesh wound on your hand and face. Basic malfunctions to train for are: Double feed, chimney block, misfire, and perhaps a squibb.