Air Venturi Avenge-X Conversion Kit, Bottle Rifle to Bullpup Compatible with Air Venturi Avenge-X rifle with wood, synthetic, or tactical stocks For use with Air Venturi Avenge-X rifles with 400cc carbon fiber bottle If you are converting a tube model of the Avenge-X, be sure to pick up the bottle as well. PY-A-12988 Includes trigger linkage assembly, barrel band, scope rail and necessary screws/small parts