By cylinder lock, are you referring to the barrel-mounted latch that opens the revolver? If so, I believe the Uberti replica of the S&W American #3 and the S&W Russian have the barrel mounted latch. The Schofield replica has the latch mounted on the frame. That improvement was intended to facilitate ejecting empties and reloading while holding the horse's reins in the left hand.
The Uberti break top replicas are expensive. I believe some models are available in .38 Special.
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