Ok, shipped the rifle back to Bushmaster- they sent a prepaid, pre-addressed UPS shipping label. They received it on 8/30, it was repaired on 9/1. The email from tech support said "cut third generation feed ramps, replaced buffer spring, replaced mag catch spring, replaced rear takedown pin, test fired 40 rounds using customers mag and our mags (PMC ammo) test fired" And shipped back to me the next day, It should be here Thursday. This is hardcore, outstanding, customer service. Thanks, Bushmaster.