Yes new barrels are available from BPI for the X-150. If you have an owners manual, just call their # and tell them about it.

As long as the breechplug threads are okay, you'll be fine. If the barrel shoots good or not with the pitting is the main factor. If it shoots good, I wouldnt worry about the pitting.

X-150's are really nice shooters. I have a .50cal SS/Camo X-150