Features: Replaces rear body pin Allows placement of a zip tie by game control to prevent FPS adjustment in-game Direct OEM fitment part Compatibility: Fits Tippmann M4 Carbine Color: Black Manufacturer: Tippmann Arms Required by most airsoft fields in regulation for the use of any HPA guns, to ensure the safety of players. If you are going to play at a regulated field you may be required to have this part installed on your Tippmann M4. . This Product is Designed for Airsoft Use Only and Cannot be made to fire any other type of ammunition.