purchased m&p 15-22 on 12-30-09 fired it on new years day and blew out shell extractor. sent it back they repaired it got it back 1-18-2010 took it to range 150 rds and extractor blew out along with pieces of shell casing. used winchester super x. called smith @ wesson and they told me it would take 48 hrs to e-mail me another shipping lable????