Send E-mail to the tech department. They can tell you a lot about the bow. Even if it had any up-dates. I have two Z7’s, and I will shoot no less than 3 deer with one of them this year. If I get out west the DXT’s will be the bow of choice. They have more draw weight and smaller fibers in my sights for long distance shooting. Steve from Sure-Loc made them special for me before he passed. I have .005 in the 80 yard and .008 in the 60 yard. I take real good care of them as I only have one more replacement for the small ones.