Just a quick side by side of the Protac 2.0 and HLX lights from Streamlight. I've also included the links to both lights(HLX Pro) through Amazon if you are interested in buying either of these lights.
ProTac 2.0 https://amzn.to/3TVrCZB
ProTac HLX Pro(has the updated tail cap) https://amzn.to/3HfepUb