I would agree with the other opinions I've read here: a neglected rental, likely never cleaned, possibly out of time, and very likely a squib bullet stuck in the bore.
I wouldn't condemn the S&W 686, however I WOULD condemn that range!!
"The very atmosphere of firearms anywhere and everywhere restrains evil interference - they deserve a place of honor with all that's good" -- George Washington
"Arms in the hands of citizens may be used at individual discretion in private self defense." -- John Adams
"A free people ought to be armed."-- George Washington