This is a diagram of probable barrel markings on a Colt M1911 pistol. This covers the serial numbers of 710,000 to the end of production.
![Colt M1911 Barrel Markings Colt M1911 Barrel Markings](https://sightm1911.com/lib/history/Colt6.jpg)
This is a diagram of probable barrel markings on a Colt M1911 pistol. This covers the serial numbers of 710,000 to the end of production.
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