I wouldn't say I necessarily have a bad gun, but the one I care the least about is a Mosin-Nagant 91/30 dated 1942. The bore is pitted, it has light surface rust on roughly 60% of the barrel and receiver, and sometimes the bolt "locks up" when firing it and I have to give it a hard smack to break it loose. I only use it as a range gun and occasionally to ignite tannerite when I'm feeling like a challenge. I won't get rid of it because it's accurate as all heck and incredibly fun to shoot! Plus I've always been intrigued by old military firearms.