Thanks guys...That ref chart was exactly what I needed. I guess it is a Mossberg 500A I guess now I just need to figure out what that is. I know what a 500 is but not the A. Wonder if it will take 500 barrels.
Just for the record this site has helped me soooo much. First it helped with my first contender purchase, many hours of enjoyable reading, great stories and information.....Thanks to the whole Greybeard community!