What is the difference between a 1911 pistol and a 1911a1 pistol?

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"The 1911 was the US military sidearm as built from 1911 til about 1925. It has tiny sights, a long hammer spur, a short grip safety, a long trigger, a flat mainspring housing, and flat frame sides behind the trigger guard.

After some transition models of interest mostly to collectors, the 1911A1 was standardized with slightly larger sights to improve the aim, a shorter hammer spur and a longer grip safety to reduce hammer bite, an arched mainspring housing to give a higher natural point of aim for snapshooting, and a shorter trigger with finger clearance cuts in the frame to gain a better trigger finger position.

A commercial gun similar to either the 1911 or 1911A1 is properly called a Government Model.
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