I just thought I would let you guys know that empire has come out with its own barrel kit and it is compatible with the gog freak kit. Except this one comes with three barrels and 5 inserts 1 apex barrel 1 carbon fiber barrel and one alumimum barrel with ,675,680,685,690,695 inserts this is the last barrel kit you will ever need it retails for $199 U.S. This is a steel considering I payed over $300 for all the same barrels. So if you are looking for a good barrel kit this is the one for you.