The Colt 1991 Series is a direct descendant of the original Colt M1911. A long trigger, flat mainspring housing and original style recoil spring system remain from the original M1911 design. Upgrades from the original include white dot sights and a lowered ejection port for extra reliability. It still remains "the standard" that everyone tries to imitate, but no one duplicates.
I looked it up.
The Colt 1991 also has what Colt has dubbed their Series 80 firing system. Essentially, this means the Colt 1991 has a trigger-activated firing pin safety that prevents an accidental discharge from occurring in the event the gun is dropped. The older M1911 and M1911A1 models originally issued to the U.S. Military do not have this firing system.
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