Gas operated automatic firearm having a barrel with a gas conducting insert

• US 3,359,860 A
• Filed: 11/17/1965
• Issued: 12/26/1967
• Est. Priority Date: 11/19/1964
• Status: Expired due to Term

• Current Assignee: Ernst Muhlemann
• Original Assignee: Ernst Muhlemann
• Inventors: ERNST MUHLEMANN
• Application Number:
  US04/508,229
• Time in Patent Office: 769 Days
• US Class Current: 89/193
• CPC Class Codes: F41A 5/26 Arrangements or systems for bleeding the gas from the barrel F41A5/20 - F41A5/24 take precedence

Claims

1. AN AUTOMATIC FIREARM REGULATED BY GAS PRESSURE COMPRISING A BARREL HAVING A GAS INLET AND AN EXTERIOR SURFACE, AN EXPOSED GROOVE EXTENDING IN THE LONGITUDINAL DIRECTION OF SAID BARREL IN THE EXTERIOR SURFACE OF SAID BARREL, A LONGITUDINAL INSERT PIECE HAVING ITS TWO ENDS LOCATED COMPLETELY IN SAID GROOVE AND HELD THEREIN BY SAID ENDS, SAID INSERT HAVING A GAS CONDUIT THEREIN WITH A GAS INLET AND GAS OUTLET SPACED FROM ONE ANOTHER IN THE DIRECTION OF SAID BARREL, A BREECH CASING HAVING A SEALING SURFACE WHEREIN SAID BARREL IS REPLACEABLY MOUNTED BY SAID INSERT PIECE, A GAS CYLINDER IN SAID BREECH CASING HAVING A PISTON DISPLACEABLY BY THE GAS PRESSURE, A GAS INLET BORE IN SAID BREECH CASING EXTENDING TO AID GAS INLET BORE GAS INLET BORE TERMINATING AT SAID SEALING SURFACE, A FURTHER SEALING SURFACE ON SAID INSERT PIECE CONTACTING SAID SEALING SURFACE ON SAID BREECH CASING, SAID GAS CONDUIT WITHIN SAID INSERT PIECE CONNECTING SAID GAS INLET BORE OF SAID BREECH CASING WITH SAID GAS OUTLET OF SAID INSERT AND THROUGH SAID CONDUIT TO SAID GAS INLET OF SAID INSERT TO SAID GAS INLET OF SAID BARREL.