All HyperDrive ETUs come with a 1 year limited warranty against manufacturing defects, where a full refund or replacement will be issued at no cost. Warranty is void if any user-caused damage is present, including damage due to faulty installation, incorrect battery polarity/voltage, physical damage, or evidence of tampering. Hyperbolic Labs LLC is not responsible for any damage to your airsoft rifle caused by HyperDrive -  by installing, you assume all risks involved.