I went to the range today with the wife... We brought the AR with the - Spikes Tactical .223/5.56 upper ~ and ~ - Rock River Arms .458 Socom upper. After getting everything setup, (spotting scope, target, sand bags and scope) I was finally ready to send my first .458 Socom down range to the 25 yard target to get the 4x scope sighted in. After very careful aiming i slowly squeezed the trigger... click... now if I could just squeeze a little more the round is about to go off... wait! did I already hear click!? Great... miss-fire... probably my fault, so I cycled in another .458 and gave it another pull... CLICK AGAIN!!! So it goes on like that for a while. I eventually had the range master come over and explain how my bolt and firing pin needed to be cleaned before coming to the range. How the parts were very sticky and gritty. CLEAN WHAT! Why? this was new in box when I came to the range. Why do I need to clean it? well... I did find it crazy as to how much black grease was on the parts with it having never been fired before. So I put the Spike's back atop the Spike's lower and we finished sighting in the irons at 100 yards. It gets me that my NEW upper didn't work at all. I got home and took out both bolts and firing pins... Can anyone spot any differences??? Keep in mind not a single shot fired on the RRA, why so dirty? No big-bore holes to report, just little ones: Started at 25 yds to get the sights together. At 100 yards, had to adjust the sights down about 6"