I learn this morning that the rifle used in the Scalise shooting was an SKS. The SKS first came into general notice as a Chinese-made assauult rifle used by Viet forces during the Southeast Asia adventure of the 1960s. It is a shoulder-fired, gas operated, magazine fed semiauto rifle that fires the 7.62x39 round made famous by the Com-bloc nations.
Hundreds of thousands (if not millions) of these rifles were imported to the US after the Vietnam conflict. I can recall seeing entire racks of SKS rifles in the local stores, selling for $89.00 each. They were cheaply made, and not noted for stellar accuracy, but they are rugged, durable, and inexpensive.
But, it looks as if the initial reports of the left-wing, Bernie supporter using an AR variant are woefully incorrect. He was shooting an SKS, a Com-bloc rifle.