The ornamental design for a gunholster, as shown and described.
FIG. 1 is a top perspective view of a gun holster;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a top perspective view of the gun holster, showing the holster detached from the pair of suspenders.
The broken line showing of a magazine holder, suspender clips, and strap adjustment loops is included for the purpose of illustrating environmental structure and forms no part of the claimed design.