DPMS doesn't make two grades of bolts, carriers, or barrels. The Sportical is less expensive due to less features, not lower quality parts. To say some DPMS rifles are ok and others not simply isn't acknowledging the fact that they all get the same stuff. Of all the stuff you guys have listed ONLY Saber makes most all of it's own parts.
Are all of the DPMS barrels the same other than profile? I was thinking some of their models had chrome lined barrels but after browsing their site I didn't come across any that did.