It's alright :v I'm pretty sure when I watched RGM's videos, both guns perform melee attack with RMB and then transform with 1 button. If that has been changed, we'll take another look and adapt a new name for them :v
Nah Ron, they updated both weapons to transform only with the "Press 1" because now the Knife Mode has stab attack.
It was RMB before (beta and some time after release) but they updated it :v
If you watch old videos you will see that the weapon didn't had the transformation on the "1" but instead it had the RMB :V recent videos show the updated ver.