I have a AR-15 that I cant seam to get to extract shells most of the time. The shell stays in the barrel and I cant get the handle to pull back at all. I need to lightly hit it with a dead blow hammer to get it to open up then I need to shove a dowel down the barrel to get the case to come out. It also seams to not want to close all the way after I let go of the charging handle. I'm not sure what the problem is. I have tried over 10 magazines of different manufactures different ammo over 7 different kinds and am at a loss. Any help would be greatly appreciated. Thanks.