I don't know anything about dryfires, other than the sound is unbelievable, but I can tell you I sold 3 compounds over the net on archery classifieds all of which I had purchased new. If in doubt, communicate with the seller and see if he will give you a 1 week period to have the bow checked out at a pro shop after you receive it. If it is deemed to be damaged goods, he should agree to take it back.

Bill