I pulled the barrel. I pulled the FSB. My plastic harbor freight calipers were useless to measure the port. We picked up a #51 (.067") drill bit. We put a dowel down the bore and carefully drilled out the gas port with a cordless drill.
We ran a brush down the bore a few times to clean it out.
Reinstalled everything. Got her juicy and brought a magazine full of Tula. She dumped the mag and it locked back after the last round.
So far so good.
I have to credit this archived post. It's exactly what I did.
Not sure who it was but Thank You.
"A mil-spec 0.063" gas port will only ever be a problem if you're shooting extremely weak ammo. In that case, a slightly larger gas port "may" be desirable. That said, something on the order of 0.067" would be sufficient. That's what Noveske used when they made carbine length N4 light carbine barrels."