A Type 3 malf (a double feed) often results in a stuck mag. They're not as common as other malfs, but they do happen. Naturally, the unforseen part is why they're called malfunctions, rather than functions. If you get a bad one, you'll know it. Although, with the grooves at the base of the Steyr grip, there might be enough mag base exposed where this wouldn't be a prob for you with a Type 3.