I need a little help in the shotgun porting department, Well lets start off by telling a little about my capabilities I'am a tool and die machinest and I've picked up building my competition guns I've built a limited pistol and a AR now I'am in the stage of getting my 1100 ready for open 3 gun and I was wondering about porting, so if someone has knowledge on this or if you have a ported shotgun, I would like to know about the hole diameter , center to center hole location, and how many holes and if it's one row or two rows of holes. Thanks