The ornamental design for a firearm accessory mount, as shown and described.
FIG. 1 is a perspective view of a firearm accessory mount incorporating my new design viewed from rearward, above, and from the right side thereof;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view thereof viewed from rearward, above, and from the left side thereof when associated with environment of an optic accessory and a handguard.
The uniform broken lines in FIGS. 1-8 represent environmental structures, such as an optic accessory and a handguard of a firearm, and unclaimed portions of the design and the dash-dot lines illustrate boundaries and form no part of the claimed design.