Gunman,
I dunno who "they" is, but they must be right, because I'm having a hard time following you. grin

I think you are saying the barrel centerlines are on the same horizontal plane. I think everyone here would agree to that. I don't think "parallel" is the right word. But, English is a second language here. smile

I'm sure this is just a miscommunication between you and 2pipes. I think both of you full well know barrels converge on sxs and o/u guns, each for slightly different reasons.