+1 on all the positive comments.
I currently have 3 680 series guns.
The only failures I've seen on 680 series guns have been three differet cases of broken hammers.
One of them was my trap 682, a 1985 production gun. It fired quite a few shells before the failure. The hammer simply fractured into two pieces.
The good news is that Cole's sent me a hammer and it simply dropped in without much fuss or disassembly. Just drive the axle out with a pin, and presto - new hammer.
I'd take a spare set of hammers to Argentina.