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Straight bolt handle - Earliest C models up to 1961 when bolt handles became curved : 1949 -1960
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Here are some known facts as they pertain to your rifle: Until 1956, the rear sight was soldered with the first year knurled windage adustmentsġ960 5 M/M Cal & Made in USA added to pump tubeġ961 saw evolution of the bolt from straight to curved to pear shaped with hole (eventually removed 1975)ġ963 with a switch from the hold down safety to the rocker safetyġ964 changed the front sight to a forward ramp style.ġ964 Inspection dates were stamped on left side of receiver (Backwards and alphabetically) from 56 > 58 Oh it's at Mac1 for a steroid tune and to replace the worn out pump lever.
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I got this when I asked about my Silver Streak best guess mine was mfg.