I was looking at my American arms co Whitmores and had forgotten they had a fixed tapered lug that the barrel extension rested on when closed. When I first saw Ken's gun I thought that both the lugs were actuated by the top lever (reminded me a little of a French Ideal) but after looking at my guns I suppose the angled lug is fixed. Is that right Ken, or does the top lever retract both lugs? On my guns the lug is manually adjustable for wear by turning a screw on the bottom of the action.