I just got to give Del-ton a big happy customer plug. Building my first AR15 and one companies name kept coming up for value and quality, Delton. But what really sold me was the great costumer service that was always mentioned. I ordered my mid-length upper kit with heavy barrel. Had it in hand in one week from placing the order. The heavy barrel turned out to be just that, way heavier than I was thinking. Regret sank in, should have got the light weight. Went online and chatted with Kayla, instantly, and was more than polite and helpful. Allowed be to ship the kit back and exchange it for the light weight upper. Had it in hand in one week. Put it on a lower, lubed it up and fired 80 rds. flawlessly. You can't go wrong with these guys, the uppers are headspace checked and test fired before they ship and the quality and service are awesome. So keep up the good work Delton, your customer base will only go up. -Thanks