We claim the ornamental design for accessory for rifles, as shown and described.
FIG. 1 is a right view of accessory for rifles showing my new design;
FIG. 2 is a left view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a perspective view thereof; and,
FIG. 7 is a perspective environmental view thereof.
The broken like showing of the accessory for rifles in FIG. 7 is for the purpose of illustrating the environmental structure and forms no part of the claimed design.