"Change to a lighter buffer in a rifle lower and it'll run anything, even some really mild reloads."
I'm lost on this one as well, there is only one A2 stock buffer and spring (specialty buffers excluded) and it's for a rifle gas system. The middy has more pressure, if you have to go to a lighter buffer, something is terrribly wrong.
If you're running a carbine stock on a rifle gas system then, yes it can be tough to find the right combo.
