ok, so i got an AR 15. bushmaster, when i first got it, she worked great, kept her clean and all, no problems. here lately its been choking like crazy. FTL FTE's all kinds of stuff. i finally went to the range today to shoot it for the first time in a month or two and i got 50 rounds into it before all hell broke loose. Every round got jammed, no joke. Rack, Fire, Jam, Safe, Lock open bolt, Remove mag, clear jam, insert mag rack fire, jam.. and so on. not only that but when it wasnt doing that it was not loading in the next round AND not holding the bolt open after firing. Now i will admit i was using some brown bear ammo, which i usually dont like doing, but with ammo prices.... but even when i thought that was the problem i cleaned it real quick and started loading remington green and white's with the same problem. not only that but TWICE i had the bolt get totally stuck with a spent round in the chamber, i had to bang it on the ground to get the bolt to move, worst shooting trip ever. on a good not the XD performed great! who has ideas? is it the gun? the ammo? whats the deal???