More than just a few years back, I purchased a Mossberg 500C 20ga. This came with the 18.5 inch barrel and PG. Not long after that, I ordered a stock, that PG is just not realistic. When the next squirrel season was looming, I sent off to Cabela's for a 26" vent rib barrel, with choke tubes.
Now I know the 20Ga doees not stack up with the 12 for many things, but I have always enjoyed this little Mossy, and have carried it as a truck gun, or used it as a bedside shottie many time.
The versitility is there, to do a variety of things, with the right accessories. I am looking at a rifled barrel, and scope, for deer hunting in heavy cover, as the next accessory aquisition.