First Person Animations - ZigyTheBird/ZigysPlayerAnimatorAPI GitHub Wiki

While there is a method with a boolean paramater for better combat style first person animations I highly recommend learning the new way to do first person animations which is using modifiers.
Please check out the wiki page for modifiers as well as this example.
As of writing this the THIRD_PERSON_MODEL first person mode is the only viable first person mode which gives you better combat style animations, but that may change in the future.
In the near future there will also be a way to render armor alongside the player's arms in first person.