The ornamental design for a convectioncontrolsleeve for firearms, as shown and described herein.
FIG. 1 is a perspective front view of the convection control sleeve having an arcuate upper surface and octagonal base portion, taken from a top-left angle in accordance with my invention;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The surface indicia of parallel lines also form no part of the claimed design and are merely surface shading.
The broken line showing of aspects of the claimed design in FIGS. 1 and 2 is included for the purpose of illustrating environment and forms no part of the claimed design.