The ornamental design for gas hot air gun head, as shown and described.
FIG. 1 is a perspective view of a gas hot air gun head showing my new Design, the broken line drawing of the gas hot air gun head is for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a front view thereof, the broken line drawing of the gas hot air gun head is for illustrative purposes only and forms no part of the claimed design,
FIG. 3 is a left view thereof, the broken line drawing of the gas hot air gun head is for illustrative purposes only and forms no part of the claimed design;
FIG. 4 is a right view thereof, the broken line drawing of the gas hot air gun head is for illustrative purposes only and forms no part of the claimed design;
FIG. 5 is a top view thereof, the broken line drawing of the gas hot air gun head is for illustrative purposes only and forms no part of the claimed design;
FIG. 6 is a bottom view thereof, the broken line drawing of the gas hot air gun head is for illustrative purposes only and forms no part of the claimed design; and,
FIG. 7 is perspective view thereof, and shows the gas hot air gun head connected with a gas bottle, the broken line drawing of the gas hot air gun head is for illustrative purposes only and forms no part of the claimed design.