Available Align T-REX 300X Dominator Kits. The 300X Super Combo - Ready to Fly is a good choice if you do not have a radio transmitter or looking to be in the air quickly; includes everything and you will be flying as soon as you charge the battery. The 300X Combo - Bind and Fly is ready to accept any flybarless gyro. Both kits include an assembled T-REX 300X