It was around 400 feet, but that’s still absolutely nothing for an AR. My 65 year old mother was hitting a six-inch target at 300 ft her first time ever shooting.
For comparison, Army recruits have to hit a human sized target at about 500 ft to qualify. And basically everyone qualifies.
Effective range for an AR is like 1500 ft.
I’m not a great shot and I can easily shoot a 2" grouping at 600 ft. I’ve hit moving deer in the woods at around 500 ft. It’s not a hard shot if you know what you’re doing.
If he had aimed center mass, like a competent shooter would, Trump would probably be dead.