Does any one know who makes one for the Barrett 99?

AAA makes one...

AAA-Ammo

I use the AAA-Ammo Delrin Bore-Guide and it works well.

Save yourself some bucks and buy a cleaning rod like this
Tipton 1-Piece Deluxe Cleaning Rod .

Thanks for the link I need to get the guide. I have a 60" rod, need to measure the OD. Mine are either coated or Carbon Type. I hate to hve to buy another rod. Price on their ammo is also good.

ar15inmn..Is the cleaning rod the same Dia. has the one AAA sells or is it a lose fit in the bore guide?

Quoted: ar15inmn..Is the cleaning rod the same Dia. has the one AAA sells or is it a lose fit in the bore guide?

I spent the money on the AAA before I saw the Tipton.

The Tipton is listed as a 50 BMG rod so I assume the size will be comparable.  The only specs I have found are:
Thread Size: 8-32 Threads (Standard)
Material: Carbon Fiber
Length: 62"
Notes:
Chemical Resistant
Will not harm bore.
Will not bend or warp.
Two-bearing handle allows for true following of rifling for a deep clean.
Features an ergonomically designed handle.
Will not accept Outers accessories.

If I can find the diameter I will let you know.