Single-barrel gun
FIG. 1 is a side elevational view of a single barrel gun showing my new design with the opposite side being a mirror image; 
     FIG. 2 is a rear elevational view thereof; 
     FIG. 3 is a top plan view thereof; and, 
     FIG. 4 is a front elevational view thereof; and, 
     FIG. 5 is a bottom perspective view thereof.