EVO Barrel Trunnion difference

[tal35]

I have an old EVO S1 and I am putting an HB micro barrel into it. The new barrel that came with a trunnion, on the new barrel, the new trunnion is different.On the old trunnion, it has a 1/4" lip at the top on the breech side, above the extractor cut, the new one doesn't does this matter?

[coanan]

You're good to go, had same question when I did mine.  Lip is there so you can't use full auto bolt, other one you can, but shouldn't.