TSC always make some best replacement and hop-up parts for various airsoft guns. This one is specifically made for Marui G17/18C. Simply install this reinforced 7075 CNC hop-up chamber and make it as one of the longest lasting parts in your G17/18C. Package comes with all necessary parts for installation.
Please keep in mind that aftermarket parts may need fitting or minor modification during installation, especially when it comes to steel which is strong stuff so be patient, it may take a little longer to brake in than other softer materials.