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I found this silver shell casing with MK 15 MOD 4 stamped on it, it is a rimfire casing. This was my dads, so i'm guessing he got it while he was in the Navy. My question is, what gun fires this type of round? Sorry if this is the wrong place to ask this question. I couldn't find any info on the internet about it. Thought you guys might know what it is.
