Yep. 686 no dash up until current models are made in 6 shot. The 686+ (7 shot) started in the -4. The -4 and -5 do not have a lock.
Perfect.
I used this to narrow my searches and I now have a 686+ without a lock on its way. Silly, I've searched for this gun many times and would just get frustrated staring at hundreds of 6 shot no-lock and 7 shots w/lock.