Ladies and gennulmen, my $.02....
I admit to bias, 40 years of near perfect service will bias the H*ll out of anyone.
There's very little out there in Shotgunland I haven't attempted with an 870.Actually, many 870s.
And usually I hit the clay,drag home the venison, grass the bird, or negatively affect the bad guys' sphincter control.
My lifetime total has to be approaching 50K rounds. Other than deliberately induced glitches or badly abused agency weapons, zero probs.
While the Mossie's a good serviceable weapon, I doubt that equal use under same conditions would have run up that record...