This diagram provides some of the commonly found markings on the Colt M1911 pistol in the serial number range of 85,000 to 450,000.

Colt M1911 Barrel Markings
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This diagram provides some of the commonly found markings on the Colt M1911 pistol in the serial number range of 85,000 to 450,000.
Colt M1911 Barrel Markings
Comments, suggestions, contributions? Let me know