Isn't this a unusual pale eyed bird?

Adults with pale iris are rare but regular. While this may be sign of hybrid origin and other photos may reveal dismissing characters, based on this photo alone the bird appears to shows no other obviously atypical features.

I agree with Kent. Some GWG have pale eyes.The dusky outer primaries are probably okey for a pure GWG.

JanJ

In Glaucous-winged x American Herring Gull hybrids the blackish-grey colour on the outer vanes of p9-10 typically reaches up to the primary-coverts. This is not the case in this bird and even though such hybrids are variable in both plumage and structure and extreme individuals can strongly resemble either of the parent species, I feel satisfied with the bird in this photo being a pure GWG.