Trained marksman with a scope and a rest and probably custom ammunition.I can hit a Toonie with any of my rifles at 100 yards, not the center but at least a piece of it, I am no expert marksman.
At a range of 130 yards, to hit an earlobe, would be like hitting a Toonie dead center, add to this the target is moving around as Trump talks.
The counter sniper took the shot from between 100-130 yards at a target the size of a small pumpkin hitting him pretty much dead center just below the left nostril.
(That is my own assement of the entry point from the pictures I have seen, nothing has been releaseed on the shooters injuries, other than he was shot in the head blowing the back of the skull out.)
I am still boggled that the rooftop the perp shot from wasn't secured ahead of time and kept secure!