Hi power kit included: -enhanced gearbox Ver.II -switch assembly (fixed stock) -infinity steel gear set -special bore up cylinder kit -polycarbonate piston -anti-heat selector plate -6mm steel bushing -steel anti reversal latch -steel enhanced cut-off lever -ball bearings spring guide -enhanced tappet -shim set -gearbox inside spring set -steel trigger set -safety cover -teflon grease spring is not included(max sp170)