06-23-2011, 10:32 PM
I'd have to agree with Robert. That's seems way too small of a gas port. I had the basic same problem with a 338 Federal DPMS upper. They drilled the port the same size that a 308 should've been. The 338 Federal needs larger. I drilled it out and it runs smooth as silk. I'd go with the 0.085" unless you can prove the gas block is leaking.
