I have a question, I tried to shoot a beaver that was inside its hole with my ar 15 and when the barrel was inside the hole it would not cycle. When I took it out of the hole it cycled perfect, I tried shooting in the hole about 10 times and same problem. It was not ejecting the spent case. The gun is custom build with an osprey piston kit. It has never had any other problems. Just want to know why it does not work inside a hole in the ground? Thanks.