To start off I own 1911 fully loaded and XD-9 tactical with a 1000+ rounds through each with no problems. Rented a glock 23 at the range close to home and was impressed with it but had to go to another range to rent the XD-40, just the fully supported chamber issue. OK xd-40, 50 rounds of ammo, 2 targets, 1 failure to fire, 11 failures to go into battery. Guy behind counter " must be a bad magazine, here use my mag". 20 more rounds and 2 more failure to battery. Each time the spent case would eject but next round would hang up on the extractor and the nose of the bullet would be in the barrel sort of at a 45deg. angle. Not sure if failure to go in to battery is the right term but dissapointed none the less. Any ideas what the problem was? sure would like to know.