Stan: The only weakness of the Beretta O/U design I'm aware of is the hammers. I've seen three broken hammers over the years, all on 682 trap guns. The 680 series hammers seem to be all identical. This seems to be a fatigue issue, as all failures were on guns that were well used.
If yours is getting up there in total rounds fired, I'd recommend either replacing the hammers before your next trip or taking a set of spares and some tools. Replacement is very easy, just pull the stock, drift the axle partially out, replace hammer, pull the tail of the hammer strut out far enough with a pliers to reseat the strut in the hammer, and reassemble. It could be done in the field in a few minutes if you know how.
Set of spares from Coles is under fifty bucks.
P.S. The stock bolt is likely to be a 6mm hex.
