Most Underrated Gun?

[Silver the Cat]

Most overrated gun for me I'll say is m4 some people think it a noob gun but if you known how to work it it will be a deadly weapon

Overrated would be people saying its the best when it actually is just alright. Do you mean underrated? If so I would agree, but the M4 still is so often talked about I wouldn't really count it as the answer I was looking for. I'm curious about a gun that, although it isn't as good as other options, is the best weapon that never gets talked about or used.