American Rifleman published this interesting article recently on the Colt commercial model 1911. I didn't know the "commercial model" was used by various law enforcement agencies, including the Texas Rangers and the U.S. Border Patrol... I guess I had always thought they got the military model for duty use.
https://www.americanrifleman.org/content/i-have-this-old-gun-colt-commercial-model-1911/
https://www.americanrifleman.org/content/i-have-this-old-gun-colt-commercial-model-1911/