I have a model 2t stag 5.56 and the first 200 hundred rounds cycled with no problem. I got home cleaned the rifle using m pro 7 and assembled. Since then I have only been able to shoot one round at a time. The case ejects fine and the next round cycles fine, but does not fire. When I clear the round it does have a light primer strike, and I can load the round with the light primer strike and it will fire. I have tried 5 different mags, all p mags and they function fine in others guns. This is happening with all 3 different types of ammo I have tried. I must have put something together wrong, as I have not added any accessories to the gun from the first time I shot it. I tried cleaning the buffer spring and re-cleaned everything on the gun again, but am wondering if there is something maybe one of you ran across or heard of that I am missing. Thanks for the help.