Well, I went to the range tonight with my XCR for the first time. Shot about 45 rounds, 20 of which were federal xm193, the rest some stuff I bought at Walmart. Gun ran fine. I learned that, when shooting in an indoor stall on gas setting 4, you can pretty much forget about collecting your brass. That stuff bounced hard off the wall and way out into the range. I also learned that a bob sled doesn't work in an XCR. I couldn't get the bolt into battery while it was inserted. I failed get my irons sighted in before I ran out of adjustment. I have an MI front and a matech rear. The front post is all the way down, and I'm still shooting about 3 or 4 inches too low at 25 yards. I had the matech set on 200. Anyone have any advice regarding what I'm doing wrong?