Well, my coach gave me this barrel because he UL'd (both barrel and frame) his PM6 and I gave it a whirl. At the time I was borrowing barrel's from team mates ranging from freak kits, to autococker 1 piece prostock barrel, kaner kit, shaft 1 pieces. So when I got this barrel I was pleasently pleased. I am not much of a 12 inch barrel guy, so I tried taking a 14 inch UL tip off of my friends ion, he would use 12 inch tip and it worked very well on the proto back. I did not have one barrel break all day. Then again, out of all the barrels I have used, I never broke a ball with my proto.
I recommend anyone get this. Its a great barrel and though I paid dirt cheap for mine, they are relatively inexpensive and very good on paint.