When I am exiting my burst damage/wildfire phase of my rotation I remove gauss barrel and if I am too quick to use split shot after removing it then the attack will still cast as if gauss barrel is attached. However I can move while casting and the attack executes like normal at the end of the cast, minus the +20% damage. This has been happening pretty frequently. Other things I have noted are that if rapid fire is active teleports are instant and also mounting requires no cast time.

Thanks!