Have you disassembled the gas tube? Perhaps there is something stuck in it? I had one that was lead fouled once. I was able to gently heat it up with a propane torch and tap it over to get it out. Dont everheat it though.
I still shoot lead. But I disassemble and clean the gas system very often.
Romans 1:16 I am not ashamed of the gospel, because it is the power of God for the salvation of everyone who believes: first for the Jew, then for the Gentile.