Originally Posted by championems
if memory serves, the XTS had spyder barrel threads, which makes your choices practically endless. the stock barrel for that marker would be a bit on the large side, 691 or better, so any decent barrel in say, 687-689 would do well for you, especially if you use recreational or field paints. inexpensive choices that are good would be CP 1 piece, J&J, or evil driver.
I believe this is correct. You can probably get a very cheap spyder barrel in the BST section. If you have no luck there, PM me and I may be able to hook you up with something.