I’m flying Vegas to Dublin would 50 mins lay over be enough to get through security for second flight?

You don't go thru security anymore, aslong as you don't exit the airport you just have to head over to your next gate. 50mins should be fine.

Once you are in the airport you just need time to go from your gate to the new gate. The killer is if your flight is off any time..

Don't leave the airport. Just hop from gate to gate. You should be fine. Most carriers close doors 10 minutes before departure. Just fyi

If you don't have to leave the airport that would be fine if you have to leave the airport it would not be enough time

I would do at least an hour and a half due to traffic in the area. Sometimes it's heavy and other times it's not.