Did you try re-attaching it to your Planet Cracker Plasma Cutter? It might not be compatible with normal weapons. Try removing the tip.
How do you dismantle a gun?
Go to "upper tool", and select "remove and dismantle".
I have actually. i tried attaching it to the Tundra Recon, Planet Cracker and the normal model but it never showed up. However, when building a Line Gun on the Heavy Standard Frame, the rotator cuff appears, but only for the Line Gun. adding it made the Line Gun silly overpowered but i didn't care because my Assault rifle had a rocket launcher
That sucks. It must be a glitch then. Oh, and Line Gun+Rotation=Dreams fulfilled.
So is combining the Revolver with a Revolver
I don't even use the Planet Cracker. It's useless compared to weapons I have now. Any Plasma Cutter that takes more than one shot to take a limb off when upgraded extensively is a useless weapon to me, and is not considered a true Plasma Cutter in my eyes.