Dave. here's how the 935 works. There is a linkage that connects the bolt the the operating spring in the buttstock, this link is shaped like a tuning fork (a "Y"). The connected end is attatched to the bolt, the two parallel arms are connected to the operatin spring. as such, the hammer must fit between the parallelbars to make contact with the firing pin. The Y on the linkage is set so that the bolt must be ENTIRELY closed for the hammer to make contact with the firing pin. If the bolt is retracted (unlocked from its lugseat) at all, the hammer hits the linkage instead of the firingpin. The way the system is setup, the hammer will fall with the bolt unlocked, but it will not contact the firing pin. This exact system had been used on the remington 1100, and its predecessor the sportsman 58, for 50 years; It works. As such, the only way an dishcarge could take place is if the firing pin broke, and seized in place, while protruding from the boltface. The mossberg uses a 1 piece, spring return firing pin (like almost all other gas guns), which makes this situation very unlikely. Even in such an unlikely event such as a shel firing as a result of a catasrophiic FP failure, in the ejection port as described in the report. the gasses would be vented out the port and barrel, this along with the fact that shotshells only operate at ~11k PSI, means that the one piece steel mossberg bolt would be very unlikely to "shatter", you'd likely loose an extractor, But thats it.
). When I got it home I tore the gun apart (very simple), and cleaned everything with breakfree clp. I've shot about 100 3-1/2" turkey loads, 25 3-1/2" Buckshot loads, 100 3" turkey loads, and a box of winchester 3-1/2" steel through it with Zero problems. It will not cycle any 2-3/4" loads except 1-1/2oz magnums. All in all it has been a good gun for my needs which are basically predator calling and long range crow shooting. The only real change I'd like to see made to the gun is the magazine tube. The current setup is blued steel that loves to rust, they need to change to stainless, or the very least nickle plate the whole assembly. As far as the reports of discharges without the bolt being closed, I think that is a load of BS. These guns employ a link which blocks hammer travel (the same as the remington 1100) when the bolt is open; The hammer will fall, but it will not strike the firing pin.
