What size gas port should I drill?

[Spook]

Originally Posted by markpurifoy

What do you do to clean the inside of the barrel. Where you drilled into the barrel. Before shooting your gun. Is there any metal tabs hanging down at bottom of inside of barrel.

If you gain diameter in small increments the burrs have a tendency to be small...I always run a tight patch or two through the bore for any big boogers that might be clinging.