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While the .50 caliber was being developed, some [[Mauser 1918 T-Gewehr|German T Gewehr 1918]] anti-tank rifles and ammunition were seized. The [[13.2mm TuF|German rounds]] had a muzzle velocity of {{convert|2700|ft/s|m/s|abbr=on}}, an {{convert|800|gr|g|abbr=on}} bullet, and could penetrate armor {{convert|1|inch|mm|abbr=on}} thick at a range of {{convert|250|yard|m|abbr=on}}.<ref>{{Harvnb|Chinn|1951|p=184}}. Chinn states that the German round was 12.7-mm anti-tank, but it may have been the [[13.2mm TuF]] round. The Germans were working on their [[MG 18 TuF]] heavy machine gun.</ref> Winchester improved the .50 caliber round to have similar performance. Ultimately, the muzzle velocity was {{convert|2750|ft/s|m/s|abbr=on}}.<ref>{{Harvnb|Chinn|1951|p=186}}</ref>
Both the [[United States Army|US Army]] and the [[United States Navy|US Navy]] adopted the M1921 after World War I, using it mostly as a static anti-aircraft weapon due to its {{convert|121| lb|abbr=on}} weight.<ref>{{cite book |title=Weapons of Patton's Armies |last=Green |first=Michael |year=2000 |publisher=Zenith Imprint |isbn=0-7603-0821-7 |pages=31–33 |url=https://books.google.com/books?id=a8jk6165Q08C
A slightly improved version, the M1921A1, was introduced in 1930 with all of the M1921s being upgraded. The gun weighed {{convert|79|lb|abbr=on}} without water, was {{convert|56|in|m|abbr=on}} long, and had a {{convert|36|in|m|adj=on}} long barrel. The gun was mounted on a pedestal mount with three horizontal legs. It had a 500-650 rounds per minute rate of fire.
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