William has identified one of the most often miss diagnosed problems with these guns, one I fixed for a friend after numerous gunsmiths had replaced firing pins, hammer springs, then made over length firing pins etc.
It could also be a loose forend which after tightening will bring the forend back enough to cock the hammers.
To answer your origional question, the answer is yes, it does take a lot of heavy use (in my friends gun 35years of Trap shooting at least once a week)
From there other ugly problems will rear thier head, like the inertia block not engaging the sear because it is worn on the pivot pin that the sear rotates on.
Heavy use will also see some deterioation of the wood behind the locks, usually with little bits flaking away and blocking up the mechanism, ulyimately the stock will let go and you could end up with the stock in two pieces.
Factor into your price a full rebuild of the action by a competent gunsmith skilled in this particular gun and possibly a restock
Hotrack
