Ultra-Lightweight Blowback Housing is precision CNC machined from aluminum for enhancing durability and quality. Weighing in at just 17 grams, this blowback housing will improve the cycling action as well as gas transmission and provides smooth and fast blowback action, with better gas efficiency while using this blowback housing. The sliver plate is designed for protecting the piston to avoid malfunction. It is compatible with Tokyo Marui M&P9L. Highlighted features Aluminum material with CNC machined Ultra lightweight design Durable construction prevents flexing and warping under hard use Provide stable and smooth blowback cycling Strong Screw glue is needed for installation. Use a drop of screw glue when installing the screw and wait for it to dry out overnight. Damage could be caused to the screw thread if screw glue was not used. *PS: Please note: installing parts / assemble /fitting airsoft gun will need intermediate knowledge; for expert or airsoft gunsmith. Please refer to your airsoft gunsmith for proper installation/fitting. Fitting may be needed as the condition of each airsoft gun might be different. Regular maintenance is needed for all airsoft guns in order to keep it in good working condition and reduce wear out issue on parts.