1. IN COMBINATION WITH A VEHICLE DOORWAY, A SMALL CALIBER FIRING SYSTEM COMPRISING A SMALL CALIBER WEAPON HAVING PINTLE-TYPE TRAVERSE AND CONNECTION MEANS, A SWINGING EXTENSION BRACKET HINGE MOUNTED TO THE FRAME OF SAID DOOR, SAID BRACKET INCLUDING IN ITS DISTAL PORTION A PINTLE HOUSING FOR SAID PINTLE-TYPE TRAVERSE AND CONNECTION MEANS, SIDE AMMUNITION CARRIER MEANS FOR SAID SMALL CALIBER WEAPON, AERIAL SIGHT MEANS MOUNTED ON AND ABOVE SAID SMALL CALIBER WEAPON, DOUBLE HANDLE AIMING AND FIRING MEANS FOR SAID SMALL CALIBER WEAPON, WIND DEFLECTION MEANS FOR SAID DOOR OF SAID VEHICLE, AND A SUBSTANTIALLY J-SHAPED SAFETY BAR MOUNTED ON SAID FRAME OF SAID VEHICLE DOOR SO DISPOSED WITH RESPECT TO SAID SMALL CALIBER WEAPON AS TO ALLOW THE GUNNER TO LEAN AGAINST SAID SAFETY BAR WHILE FIRING SAID WEAPON WHEN SAID BRACKET IS EXTENDED AWAY FROM SAID VEHICLE.