Notbubba,until we develop a hinge in our forearms, the much vaunted shorter length of a PG only shotgun matters little.
I've a standing challenge to a shootout with the PG only folks, after a year there's been no takers.Shoulder fired shotguns are deadly, the PG jobs much less so.
As for full stocks w/ PGs, I've seen no advantage nor disadvantage to them. The standard stock works for me quite well.