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In my eyes, removing the extremely fast fire-rate from Mamba's Boy is like making TNT Launcher shoot in a straight line and explode instantly on contact to make it a variation of the Bearzooka. You're literally taking away the defining aspect of the weapon that's even stated in its description.
Sure, the rapid-fire was annoying, but that was only in some instances where its damage was high. Before it was change to the Downgraded Viper Rifle we know it as today, the damage wasn't actually all that high, making it fair unless the user stacked Damage Equipment. Mamba's Boy should return to its rapid-fire state to make the weapon feel unique again, but its damage must be changed reasonably as well to avoid uproar from players.