Mr. Dennis is a very lucky man. Congratulations!
Brett, here's a comparison of two 10 gauge hammer guns; the "goose gun" on the top has 30 inch barrels, and the one on the bottom has been cut down to 20 inches, apparently for coach gun-type use (the shortening happened a long time ago, and note the alluring wire-wrapped stock). Most of the "guard" guns would have been in the heavier gauges.