[Lolzytripd]

So on 2.51 They can once again use fist skills with an empty main slot. With mixed martial arts and a glove slot you cannot use fist skills.
Key sigroganalegend
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EDIT: Might be related to the sub attack bug/MMA bug. but when attacking with sub attack and MMA you still use your main slot weapon for the sub attack. I recommend fixing that first and seeing if that does it. Example, had a dagger main slot, tried to sub attack, only sub attacked with the dagger not R.R cannon.

EDIT2: Headshot will apply shell effects, basic attack will not. The ghetto fix in my mind is just giving Revolved Raid cannon "Can be used for gun skills tag" just like red argus/black xyston have the tag for their effects.