We claim the ornamental design for a housing for an optical system of small and light firearms, as shown and described.
FIG. 1 is a front elevation view of a housing for an optical system of small and light firearms showing our new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a front-left-top perspective view thereof;
FIG. 8 is a front-left-bottom perspective view thereof; and,
FIG. 9 is a front-left-top perspective view thereof, in an environment of use.
The broken lines in FIG. 2 represent unclaimed portions of the housing for an optical system of small and light firearms and form no part of the claimed design. The broken line in FIG. 9 depicts unclaimed environment only and forms not part of the claimed design.