Rocky Trigger Lever was specially designed for heavy use and capable for high tense competition needs. It constructed by a single piece of steel with CNC machined. Its strength hardening structure ensures the lever was in perfect shape and consistently transfer the force directly to the sear, gives the user a solid and smooth trigger pull feeling. Also, titanium coating is used to reduce the friction to every contact point, keep it run smoothly and minimize abrasion. Highlighted features Steel material with CNC machined Golden Titanium Coating and Strength Hardening Reduce the friction and abrasion with contacted parts Compatible to all TM M&P9 Series *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.