Whisk together salt, black pepper, chili powder, garlic salt, cumin and flour in a shallow bowl.
Lightly dredge each turkey leg through the seasoning mixture. Shake off excess.
Brush grill grate lightly with oil to prevent turkey from sticking.
Preheat grill to 300°F.
Place turkey legs on the grill and sear on each side for approximately 3 minutes.
Brush each turkey leg with KC Masterpiece Hickory Brown Sugar Barbecue Sauce. Close the grill lid and grill for approximately 50 minutes, rotating/turning and re-basting each leg with barbecue sauce every 20 minutes.
Turkey legs are done cooking when an internal temperature of 180°F is reached.
Remove turkey legs from the grill, baste one last time with remaining barbecue sauce and serve, hot.