Enables actin filament binding activity. Involved in several processes, including actin filament-based process; embryo development; and positive regulation of actin filament polymerization. Located in striated muscle thin filament. Part of ribonucleoprotein complex. Human ortholog(s) of this gene implicated in brain compression; gallbladder carcinoma; and nemaline myopathy 7. Is an ortholog of human CFL2 (cofilin 2).