First of all it is a magazine, not a clip. Magazines have springs, clips don't. Secondly the 597 has problems feeding with a ten round magazine so I don't know why you would want to try a 20. Lastly, magazines of new manufacture are limited to 10 rounds by law and since the 597 came out after Klintons crime bill, you might be out of luck.

Edited by - frizzellr on 09/11/2002 09:17:43