Differences between S&W 13 vs S&W 19?

The 19s have adjustable sights, and started out with pinned barrels and recessed cylinders. The 13s have always been more of a utility gun, an M&P. The 13s have the heavier barrel.

The 19s were available in 2 3/4", 3" (rare!), 4", and 6" tubes. The 4" and 6" are usually square butts; the others are round.

The 13s were available in 3" and 4" tubes, with round butts on the 3" and square on the 4".

You should consider buying Supica & Nahas' Standard Catalog of Smith & Wesson, a terrific book.
 
Depends on who you ask. The S&W M10 was developing problems in stopping power due to PCP abusers. Many agencies were trying to find a cheap way to hot rod their M10s in 38 Special with extremely limited budgets, 0 federal or state matching funds and 0 LEAA grants. NY state agencies first asked why S&W could not make M10s into 357 Magnums. S&W began developing prototype conversions with M10 frames, 357 Magnum chambering and added/strengthened internal action parts/cranes and cylinders as the project moved along. The use of a dedicated magnum frame was seen as the only way to go for durability. The use of a dedicated magnum length cylinder and proper heat treatment was added too. S&W had a house full of stock. The slow transition resulted in agency upgrades to M&P style M13 357 Magnums to replace the M10s and still use most of the same issue Sam Browne belts/holsters/speedloaders/drop pouches and training methods. The M65 was the same S&W in stainless. The M19 was a development of a upgraded 357 Magnum with adjustable sights, front ramp inserts and added features such as pinned barrels, recessed cylinder chambers, wide triggers, wide hammers and basically give a LEO a target revolver. The M19. The M66 is the same revolver in stainless. The current replacements are the 619 and 620.
 
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