Thanks bushveld and Kutter for your detailed response. The cocking slide does not appear to be the answer. I compared the 16 in question to my 12 and the 12 functions exactly as you described. The 12 stops with minimal movement and then requires pressure on the barrels to cock the gun. On the 16 in question the cocking slide is not loose, absolutely no evidence of wear, looks new. Cocking slide mates as described with minimal barrel movement, however further relaxing of the barrels begins the cocking process, barrels begin to drop which leads me to believe I have weak coil springs for the hammers. The next issue which started this thread, barrels not opening appears to be a separate issue. My thumb is blue in attempting to push the top lever to the absolute farthest right (stop). It appears as if the rotating locking barrel is not retracting enough to disengage from the barrel lug. What might be worn? With Pumkin Mountain apparently closed who has the Fox parts?