Quote Originally Posted by DeusExMachina View Post
How do you figure? It's a lower...

There are lots of people shooting 50bmg off them.

Should be pointing fingers at the upper as that's what caused it.
How do you figure? I have used that upper on 2 other lowers and never even got a jam. I would like to hear your theory on this.

The best I can tell it was caused by the buffer tube. They fit a little funky where they connect to the lower. The buffer itself is a little funky as well. It could have been either or a combination of both.