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1955 = Introduction of the Combat Magnum (no model number).
1957 = S&W begins assigning model numbers. Com. Mag becomes Model 19
1959 = 19-1 Change extractor rod from right to left hand thread.
1961 = 19-2 Cylinder stop changed. Delete trigger stop screw.
1967 = 19-3 Relocation of rear sight leaf screw.
1977 = 19-4 Gas ring moved from yoke to cylinder.
1982 = 19-5 Elimination of the pinned barrel, counter bored cylinder. Cylinder length changed.
1988 = 19-6 New yoke retention system, radius stud, floating hand and hammer nose bushing.
1994 = 19-7 Rubber grip, drill and tap frame, change extractor and rear sight leaf.
1998 = 19-8 Change frame design. MIM parts. Floating firing pin.
Standard production of 2.5" barrel started in 1966.
Jim
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