Efficacy of Revolver Dry Practice for Pistol Shooting?

[sharps54]

A Smith & Wesson, a J-Point mount that replaces the rear sight from Brownells and a Shield RMS?

My understanding is that J frames do not come drilled & tapped from the factory.

That said I don’t want to derail this thread and actually started one in search of the perfect .22 training revolver a few days ago here: https://pistol-forum.com/showthread....r-for-training