I have a browning 12ga pup shotgun. It is set up for 3 gun, has a 22" barrel with extension tube, holds 8+1. This was Jerry Harp of Rockin H Tactical's personal 3 gun shotgun. Jerry is well known in the 3 gun shotgun world for his work/customization on shotguns, especially the Browning's.
Work done by Jerry:
Made the one piece tube and the forearm brace
dovetailed in the front and rear sight
trigger work (very nice)
new stocks and recoil pad
Pictures via e-mail.
I am in the San Antonio area.