Looks like the cloud integrated tips, so a Drip tip will lock into the nut and then act as an integrated tip, so it can be tightened without removed Drip tip or needing tools

Can we get these from 5a or a maker? They seem to be selling well, seems like a no brainer to offer the 4 notch flush nut and Drip tips, can't have too many Drip tips, fast tech knows this 😂