I'm sure that everyone on this forum has already seen it but check it out anyway. On page 22 of the April edition of "The American Hunter" magazine (NRA publication) is a one page blurb regarding terms associated with actions of SxS shotguns, which are relative to our DR's. It has good pictures where everything is visible. It's a good one for those among us still learning and gaining proficiency in the basics. Enjoy! Armbar.