Seems like it would just be a cool legendary with a nice perk like black hammer or stillpeircer also its ammo is pretty low based on the weapons impact it would probably take more than or exactly 10 shots to kill someone from mid range other than the good legendary weapon idea
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If this gun where legendary no one would probably use any other sidearm. There are 6 possible combos with each one having the key perk proc or not. I'll post a list of combos and min and max values for you. I believe 10 rounds is enough.