thinhorn_AK
"DADDY"
It has nothing to do with pressure. A guy from thunderbeast even posted here when I was trying gnto figure out what to do.Thunder beast said they would not recommend it, the pressure from their cans need at least 5/8. They were pretty adamant. Many do it though. After speaking with them, I using their recommendations. Might be different for other cans.
Their issue is the thread root is too thin so there is a possibility that torque on the rifle or silencer could damage the barrel. Lots of people do it with no issues though.