Oh, didn't know it's that bad.
I thought about using a Tortofist to give an initial blast to a group and then finish off the remainder with a blaster. Mainly for RJP and constructs to bring some variety to the grinding.
Thanks for the explanation! :)
The tortoguns are a very niche weapon. Literally any 5* gun will outdps the 5* tortoguns.
With its short range and unique charge attack, the viability and usage of the tortogun is very limited.
If you go for the elemental, pierce or shadow, you're limiting the potential usage of the tortogun even further because you will have to take account damage penalty which discourages you from using the tortogun on certain levels.
If you still want and are willing to grind out a tortogun - you should go for the normal damage dealing one.
That way you can use it everywhere.