The shooter had an AK-47 style rifle with scope. It is a Soviet assault rifle design that's very popular with third world revolutionaries. Early info suggests the suspect is a strong supporter of the Ukraine fight to eject Russian invaders and a contributor to Democrat candidates.
The Secret Service did a better job this time. They apparently spotted the rifle poking out of some brush an estimated 400-500 yards distant from where the former president was. Some reports suggest they shot at whoever was holding it but missed. The suspect appears to have fled, leaving his sniper paraphernalia behind, and was picked up later unharmed.