Similar weapons are pretty common today ... it was discontinued in 1999 and has since been widely imitated. Fallout Tactics (the series’ third release and first spinoff) and the Nuka World ...

So, we're guessing that if you've got Fallout 4, then by now you are roaming ... as possible in an attempt to upgrade your underpowered weapon of choice, right? After all, those feral ghouls ...