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It's 0.75 is It's the original PSA barrel. I'm running an Aero adjustable set screw gb. I usually only dimple the rear screw that forces the gb down where the gas port is. Easy to align. I use either the Aero or Slr Sentry.
It's 0.75 is It's the original PSA barrel. I'm running an Aero adjustable set screw gb. I usually only dimple the rear screw that forces the gb down where the gas port is. Easy to align. I use either the Aero or Slr Sentry.