These are the typical barrel markings on a Colt M1911 from about serial number 25,000 to 120,000.

Colt M1911 Barrel Markings
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These are the typical barrel markings on a Colt M1911 from about serial number 25,000 to 120,000.
Colt M1911 Barrel Markings
Comments, suggestions, contributions? Let me know