Cerakote is not a great coating for actions.
It's biggest issue is its thickness. It adds a few though of thickness, and not all actions tolerate that dimensional change well. Also, not all cerakote applicators are equal. Some put it on thicker than others, and some don't have intimate knowledge of how different actions are spec'ed and what their clearances are in different areas, which can lead to more problems.
I've also found that cerakote makes actions feel "gummy". Partially because of the above (decrease in clearances) and partially due to cerakotes lack of any lubricity.
That said, there are some gunsmiths that use cerakote very successfully. I believe both
@LongRifles Inc. and
@Terry Cross do. They likely both have their own processes through years of trial and error to make it work better than others. I believe Terry also specs his actions from Defiance in a very specific way (different from OEM specs, exactly what idk) to make it work.
There's also a newer cerakote out now, that supposedly goes on thinner and has more lubricity. I think its called "cerakote elite". Personally, I'm a DLC fan. Widely available now on actions, doesn't change any dimensions, great lubricity and durability. Birdsong is great too - though only few are using it (like TacOps). Nitride is another good finish, but be aware of sending of an action for nitride treatment - it's a very high temp process, every place does it differently, and if they aren't aware of the temper of the actions it can and will cause structural damage to your action.
This is my general understanding after owning actions that have cerakote, DLC, Birdsong and Nitride, along with the knowledge I've gathered on here.