Poor tolerances (or "bad quality") lead to jamming, misfeeds, excessive wear, ect. In really bad cases (famous on the Remmington 700) the gun can actually fire

Poor tolerances (or "bad quality") lead to jamming, misfeeds, excessive wear, ect. In really bad cases (famous on the Remmington 700) the gun can actually fire when you close the bolt or drop the weapon.