You do not want a 15 unless it is a very late production one. Probably a 15-6 or later. Earlier 15's have a tapered (profile barrel) with a narrow rib. The frame nose where the barrel is screwed into the frame is machined to match this. You need the 14 or the 19, preferably the 14 (because of the cylinder lug on the frame) so that the frame nose will match the heavy barrel.
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S&WCA 1729
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