what you want is one of those retired police S&W .38 revolvers .. .357 versions are harder to come by. they used to sell for dirt cheap like about $350 with bobbed hammer. those were pre-lock models .. nothing wrong with S&W lock models, simply disable to gain back reliability.
How would I disable the lock on it? I know you can but just ain't sure how though. Can ya' do it yourself to send it off to someone?