Well the 500 is a pump action and the 1000 is a semi-auto. You're not really comparing apples to apples. Released in 1961, the 500 is a rock solid pump, available in 12 and 20 gauge with a real track record and available in different variations.

The S&W 1000 is made by Howa in Japan for S&W. If I recall it is 12 gauge only. It was dropped by S&W then picked up and marketed as...........the Mossberg 1000. The gas system does not like oil and oil there causes problems but they are fixable. A buddy has a Moss 1000. He likes it alot and shoots it well.

What are you looking for?