My Ar gave me trouble today it is jamming and wont let me pull the charging handle back to eject a round. When a round is in the chamber and i fired it clicked with nothing happening so i went to eject that round and my charging handle was stuck even when i pulled really hard. So i pushed in the take down pin and manually reset the trigger and put it back together and pulled the trigger the round then fired. So after about one more mag it happened again but this time i could get the charging handle back and i could see the round didn't set properly it was kinda sideways in the chamber so i slammed the forward assest and tried to fire and nothing happened. it wouldn't eject the round after pulling back so i pulled the charging handle back and let it slam foward then tryied to eject it again where it was then stuck it wouldn't budge like the first time. After hitting the foward assist and pulling on the charging handle for awhile i finally got it to eject. i could see some metal in the area where a chamber maid cleaning thing would go so i suspected that be why for the second time but for sure not the first malfunction. Any help would be appreciated and if somone could tell me a way to check my gas rings that would help me 2 thanks.