Opening a Trojan Grade 12 Gauge--

[Grantham Forester]

A hunting friend has a later Trojan 12- std 28" M&F, two triggers- and the series without the small "doll's-headed" rib extension. If you are just opening and closing this fine shotgun, without loads in the tubes, smooth as silk. But if loaded, and you fire the front trigger (right side barrel) and then unbreech the gun to remove the fired hull, there is a bit of "stick-ness" and a slight hesitation when you push the top lever with your thumb to do this- When you close it, fine, nice and smooth- BUT- If you fire the rear trigger (left side barrel) only, and not the front trigger, smooth as silk-

Now here's what strikes me as strange- If you shoot both barrels, the front trigger first, then the rearmost trigger, same "sticky-ness", BUT, if you reverse the order, firing the rear trigger first, then the front one, and open the breech- smooth as silk--

Safety functions perfectly, and the trigger pulls on a Lyman digital readout trigger pull gauge are 4.35 lbs. front trigger and 5.15 lbs. rear trigger (aprox.)--

Dry firing the gun, with the forearm and barrels removed, and placing a block of soft pine on the standing breech, and depth miking the imprinted firing pin tips for depth and evenness, checks out 100%--What might be the cause(s) of this random and only front trigger firing scenario? Not a huge problem, the gun shoots to point of aim, has perfect balance at just under 7 & 1/2 lbs.- Just trying to learn something.