I have an old warthog that I fitted with fiber-optic sights and a whisker biscuit and the thing shoots great. My son has a high-dollar Matthews & I out shoot him @ 40 yards with mine. He couldn't believe his eyes. Only thing about the bow that I didn't like was that the cables vibrated together but I solved that with a new guide that holds them apart more. Now if I only had a little more let-off. I noticed what appear to be some alternate axle bores in the wheels & I don't know exactly what they're for & would appreciate some enlightenment on the subject if possible.