me and my buddies use pvc for our backyard rail, so far the very end of our 4 inch diameter single pipe has cracked(it has thin walls) but our double barrel shotgun rail(2 2inch diameter thick pipes) has held up really well, stuff hardley wears down, and if it does its cheap to replace, and if you hook an edge, it usually takes a sliver off, but all you have to do is smooth that out with your edges or a file.
FUCK BIGGIE