Ok i read that in the xbox you can get his lightsaber and that it dose not stack with the other red double bladed lightsabers.
So i did everthing like the it says to, to get it. so i fight him on Manaan and get the light saber off of his body and it stacked with the other lightsabers.
Only lightsabre that I know of in the PC version that does not stack with same-crystal sabres of the same type is the Sith Lightsabre, which is quest-related (and non-upgradeable to boot).
Not sure how much of the XBox stuff translates to the PC version. /shrug
On the PC version Bandon's lightsaber is nothing out of the ordinary. No worries, though -- there are two lightsabers for sale on yavin (on your fourth trip there, after getting the final map piece) that are far superior to the xbox version of bandon's saber.