Locked action rifle for automatic and semi-automatic selective firing

Claim 1

IN A RIFLE FOR AUTOMATIC AND SEMI-AUTOMATIC SELECTIVE FIRING, AN UPPER RECEIVER PORTION COMPRISING SHEET METAL FORMED INTO A GENERALLY RECTANGULAR TUBE, A LOWER RECEIVER PORTION COMPRISING A SHEET METAL BOX OF A LENGTH AND WIDTH GENERALLY COEXTENSIVE WITH SAID UPPER RECEIVER PORTION, AN ACTION MADE UP OF ELEMENTS HOUSED WITHIN SAID UPPER RECEIVER PORTION AND SAID LOWER RECEIVER PORTION, HINGE PORTIONS FORMED ON THE FORWARD ENDS OF SAID UPPER AND LOWER RECEIVER PORTIONS TO AFFORD A HINGE ABOUT A TRANSVERSE AXIS, MEANS TO MOUNT A BARREL PROVIDED ON THE FORWARD END OF SAID UPPER RECEIVER PORTION, A PAIR OF GUIDE RODS MOUNTED IN SAID UPPER RECEIVER PORTION, A BOLT CARRIER MOUNTED ON AND GUIDED BY SAID GUIDE RODS TO MOVE WITHIN SAID UPPER RECEIVER PORTION SUBSTANTIALLY FREE OF THE WALLS OF SAID UPPER RECEIVER PORTION, A BOLT IN SAID BOLT CARRIER, MEANS TO ROTATE SAID BOLT TO LOCK AND UNLOCK SAID BOLT FROM ENGAGEMENT WITH MEANS ON THE REARWARD END OF SAID BARREL, SAID ACTION INCLUDING A TRIGGER FORMED FROM A METAL STAMPING FOLDED TO FORM TWO SIDE PORTIONS AND PIVOTALLY MOUNTED IN SAID LOWER RECEIVER PORTION, A SPACING MEMBER WELDED TO AND BETWEEN SAID SIDE PORTIONS, SAID TRIGGER HAVING A SEAR THEREUPON, A HAMMER OF SHEET METAL CONSTRUCTION FOLDED TO PROVIDE PARALLEL SIDES, SAID HAMMER HAVING A SEAR ABUTMENT THEREUPON ENGAGEABLE BY SAID SEAR ON SAID TRIGGER,