Here is some information. In the box should be the following:
Riser, rail-stock, 4 x 32 mm multi recticle scope with rings, nose bolt with a lock washer, manual, rope cocker
Lube wax, 2 each 20" Head Hunter arrows with points, allen wrenches (up to 5), quiver.
Barnett scopes came with various style rings. One wants the style that has the cap either one screw on each side or 2 screws per side. Loosen the cap the scope can be easily rotated or moved forward or backward. The vertical scope rings, everything comes loose when making an adjustment.
The nose bolt is 1/4- 20 by 2" not counting the bolt head.The bolt may be purchased at a machine shop or at an automotive store.
Checking 60X customstring website for high quality string and cables, here are the lengths:
String length: 32.938"
Cable length: 17.625
These can be purchased single as: a bow string or as 2 cables or as a complete set. These are very high quality and the company offers excellent customer service.
Barnett's chapstick tube wax is very expensive and junk. I use the Trident Silicone Grease available on the internet in a 2 fluid ounce jar. This is a high quality product that does not dry out or gum up, but stays moist. A wee bit goes a long way.
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A rope cocker can be purchased in WalMart or possibly a sporting goods store.
Here is a link to Barnett's universal manual:
In regards to the axle to axle measurement, that is just a guide line as per the manual. Adjusting the crossbow for cam advancement to match Barnett's advertised speed taking into consideration an over weight arrow-point combination or if a string or cable comes in slightly shorter (which is better than too long) this measurement will change.
If the crossbow came in the factory stapled box, the seller would not realize there were parts missing. If the crossbow was purchased used, the seller may have neglected putting in the missing parts.
Wishing you all the best.