I have a Nickle 586 no dash without the M stamp that locked up on me due to primer flowback.
It's a pain, not least because it locks the gun up loaded.
I managed to get it loose and S&W paid shipping there and back.
"Courage is rightly esteemed the first of human qualities...Because it is the quality that guarantees all others"
Winston S. Churchill
"The American Republic is finished when the Congress realizes that it can bribe the people with the peoples money"