550-1 .22 rifle. I was allowed to try it for a few rounds before buying. It ran Mini-Mags fine but I put a handful of CCI CB longs down the tube, they'd fire but wouldn't cycle the next round properly. Bolt wouldn't go into battery and had to be racked again. Im assuming even though it says it can shorts and longs, they have to be High Velocity not quiet. It was $150, it has some old scope on it, i think it's a 3x or 4x power. Its little hazy but it still worked. After buying I ran about 50 rounds of Aguila Super Extra .22LR no issues and very nice groups with my shaky hands even on bench rest. I wouldn't mind going to a more modern scope one day. I know theres a way to date to them based on the symbols?