Gas operating mechanism for autoloading firearm

Claim 1

IN AN AUTOLOADING FIREARM HAVING A BARREL, A RECEIVER TO WHICH SAID BARREL IS SECURED, A TUBULAR MAGAZINE MOUNTED IN SAID RECEIVER BENEATH AND COEXTENSIVE WITH SAID BARREL, A BREECH BOLT RECIPROCALLY MOUNTED IN SAID RECEIVER, AND LOCKING MEANS TO RELEASABLY SECURE SAID BOLT AS A CLOSURE FOR THE BREECH END OF SAID BARREL, THE IMPROVEMENT IN AUTOLOADING OPERAING MECHANISM COMPRISING A CYLINDRICAL MEMBER SECURED TO SAID BARREL AND ENCIRCLING A PORTION OF SAID MAGAZINE, SAID CYLINDRICAL MEMBER AND SAID MAGAZINE FORMING A GAS CHAMBER, AN ANNULAR PISTON SLIDABLY MOUNTED ON SAID MAGAZINE NORMALLY WITH IN SAID CHAMBER, GAS PORTS CONNECTING SAID BARREL AND SAID CHAMBER, AN ANNULAR INERTIA WEIGHT LOOSELY MOUNTD ON SAID MAGAZINE FOR RECIPROCATION THEREON, ACTION BAR MEANS CONNECTING SAID WEIGHT TO SAID BOLT, SPRING MEANS URGING SAID WEIGHT TOWARD SAID CHAMBER, GAS ENTERING SAID CHAMBER THROUGH SAID PORTS MOMENTARILY FORCES SAID PISTON AGAINST SAID WEIGHT WHEREBY SAID WEIGHT ACTUATES SAID BOLT.