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The mainspring is the powerplant of the fire control system — it provides the force that drives the hammer forward to strike the firing pin and ignite the primer
Compatible Models
J343 Smith & Wesson Used J Frame Model 640
Part Number: 515351
The warm brass color provides excellent contrast in most lighting conditions and is particularly effective for hunting applications where a bright
Smith & Wesson K & L Frame Extractor Rod 3" Barrel & longer Blue Steel 05455B000 Star Badge The mainspring is the powerplantSmith & Wesson Revolver K & L Frame Extractor Rod for 3" barrels and longer. Factory new blue steel part with left hand thread for reliable ejection. Compatibility K Frame Models: 10, 12 4, 13 3, 14, 15, 16, 17, 18, 19 (all dash variants 1 and higher, except 13 3 and 12 4 which require 3 and 4 respectively) L Frame Models: 581, 586 (all dash variants) Barrel Lengths: 3", 4", 5", 6", 8" and longer Specifications Part Number: 05455B000 Finish: Blue
