The Colt M1911A1 is a semi-automatic pistol developed by the Colt Manufacturing Company in the United States. It has been in service for over a century and chambered in the .45 ACP; with a 7 round single-stack magazine. It was an updated version of the original Colt M1911, which was made in 1911.
In the film
It was used as the standard issued sidearm of the American military during World War 2. The pistol was also seen in the hands of many infantry men; including Captain Miller's men as a side arm. Captain Miller used this and shot at the Tiger Tank on Ramelle bridge.