14 of my 28.5 years I spent on the job, I worked undercover narcotics. I've carried model (s) 36, 37, 60, 649 and 940. All excellent choices.
In late 89 or 90 (can't remember, getting old). my partner & I both purchased 342's. It was an instant hit in the office. Every Narc who handled it went out and got one. Concealed hammer, very light weight and neat lil Uncle Mike grips that fit your hand. It was a winner. I carried that gun everyday in my pants pocket. (A word of caution here, never carrying anything else in the same pocket, no keys, extra ammo, coins, pen, etc. nothing! Just the gun.) Outstanding weapon. Perfect for it's intended purpose. Up close and personal.
I still have and carry it almost everyday since I retired in 07. Matter of fact, it's the most carried gun I own. It's been back to the factory twice for refinishing, Each time the factory did an excellent job with quick turn around. Can't beat the price, free.(with the exception of one way over night fee on my end).
I know the 342 isn't made anymore, but the newer versions are and will work just great. 442, 642, etc. The conceal hammer makes for a perfect, safe carry and quick draw when needed. I give it the highest recommendation. I'm not still on the job but my 342 is.
Good Luck!