So, I thought I was crazy when I tried an H buffer in my piston build that caused it to become a single shot (Also my first time with PMC Bronze). It worked fine before with a standard buffer, Wolf and WWB ammo. I changed it back to a standard buffer and it worked fine with Silver Bear and bought some more PMC from the range and it short stroked again.

So. Anybody get PMC Bronze to work in thier x39 AR's?

Too expensive for me brother.  I shoot the cheap stuff.