The Knorr-Bremse Paratrooper Rifle (unofficial designation) was a prototype assault rifle designed and manufactured by Knorr-Bremse AG.
Not much is known about the Knorr-Bremse Paratrooper Rifle other than its place of manufacture. It was developed by Knorr-Bremse AG, a company that manufactured brakes for trains. During the Second World War, the company contributed towards Germany's war effort by producing Swedish MG35/36 machine guns, and in the early 40's it produced an unusual automatic rifle prototype to meet the Fallschirmjäger's (paratroopers) needs. It entered rifle trials alongside the FG 42 and the Krieghoff Paratrooper Rifle. The Knorr-Bremse rifle lost out to the FG 42 and Knorr-Bremse abandoned their efforts at producing an effective automatic rifle after the trials ended. A lone prototype survived the war, with parts missing, and no written records of the weapon seem to have survived.
The Knorr-Bremse rifle was a bullpup design, with a side-fed magazine. The actual internal mechanism itself does not seem to have survived.