Enables actin filament binding activity and identical protein binding activity. Acts upstream of or within actin filament bundle assembly. Located in several cellular components, including actin filament; phagocytic cup; and ruffle. Is expressed in several structures, including brain; cardiovascular system; egg cylinder; female reproductive system; and gut. Orthologous to human LCP1 (lymphocyte cytosolic protein 1). [provided by Alliance of Genome Resources, Apr 2022]