I'd go for the 686, but would take one of the later pre-lock ones:
In the early L frames ( 586, 586-1, 686, 686-1) there was a recall regarding a firing pin bushing. Some revolvers would lock up while firing because the primer would flow back into the firing pin hole. Not all. The revolvers shipped to a S&W facility have an M stamped on the frame in the yoke area.
