FIG. 1 is a top perspective view of a first embodiment of the invention;
FIG. 2 is a right side view of the embodiment of FIG. 1;
FIG. 3 is a left side view of the embodiment of FIG. 1;
FIG. 4 is a top view of the embodiment of FIG. 1;
FIG. 5 is a bottom view of the embodiment of FIG. 1;
FIG. 6 is a front view of the embodiment of FIG. 1;
FIG. 7 is a rear view of the embodiment of FIG. 1;
FIG. 8 is a bottom perspective view of the embodiment of FIG. 1;
FIG. 9 is a top perspective view of the embodiment of FIG. 1 with a barrel installed;
FIG. 10 is a bottom perspective view of the embodiment of FIG. 1 with a barrel installed;
FIG. 11 is a perspective view of a second embodiment of the invention;
FIG. 12 is a right side view of the embodiment of FIG. 11;
FIG. 13 is a left side view of the embodiment of FIG. 11;
FIG. 14 is a top view of the embodiment of FIG. 11;
FIG. 15 is a bottom view of the embodiment of FIG. 11;
FIG. 16 is a front view of the embodiment of FIG. 11;
FIG. 17 is a rear view of the embodiment of FIG. 11;
FIG. 18 is a bottom perspective view of the embodiment of FIG. 11;
FIG. 19 is a top perspective view of a third embodiment of the invention;
FIG. 20 is a right side view of the embodiment of FIG. 19;
FIG. 21 is a left side view of the embodiment of FIG. 19;
FIG. 22 is a top view of the embodiment of FIG. 19;
FIG. 23 is a bottom view of the embodiment of FIG. 19, the front view being the same as FIG. 6, the rear view being the same as FIG. 7;
FIG. 24 is a bottom perspective view of the embodiment of FIG. 19;
FIG. 25 is a top perspective view of the embodiment of FIG. 12 with a barrel installed;
FIG. 26 is a bottom perspective view of the embodiment of FIG. 19 with a barrel installed;
FIG. 27 is a perspective view illustration of a fourth embodiment of the invention;
FIG. 28 is a right side view of the embodiment of FIG. 27;
FIG. 29 is a left side view of the embodiment of FIG. 27;
FIG. 30 is a top view of the embodiment of FIG. 27;
FIG. 31 is a bottom view of the embodiment of FIG. 27; and,
FIG. 32 is a bottom perspective view of the embodiment of FIG. 27.
The dash-dot-dot lines shown in FIGS. 9-18 and FIGS. 25-32 are environmental structure and not part of the claimed design.