Save your time and money - Ballistic Advantage Performance Series .300 Blackout for AR-15 Rifle Barrels

Had high expectations for this barrel given the good reviews. However, the barrel I received had multiple flaws near the feed ramp extension, almost as if it had been dropped. I thought I was being super critical until l looked at the rifling to discover the barrel, which is supposed to be qpq nitride coated, was rusted. Now I’m out time to send the barrel back and find a different manufacturer. Would attach photos for evidence but that is not an option