You can upgrade your GR-14 and compatible M14 AEGs with the G&G ETU & MOSFET Wire Set For GR14 as it is available to order as an upgrade item... "Elevate the performance of your M14 replica with our advanced Electronic Trigger Unit drop-in kit and upgraded MOSFET for enhanced trigger response. Compatible with Version 7 gearboxes, our GR14 ETU and MOSFET will fit all compatible G&G rifles as well as many other brand gearboxes. Now available worldwide."