IO Ak repair

[ElGranTico]

[ar15barrels]

It would be much better to demill the funky rivet and set a new rivet than to swap in a new trunnion.

Also, hopefully its the rear trunnion because a front trunnion swap is basically the same as building a whole new gun from a parts kit which is what you have when you strip all the parts off the barrel and remove the front trunnion from the receiver.
Besides a new front trunnion, you will likely need a new barrel as it's only pure luck if your old barrel will headspace correctly with the new trunnion when the barrel pin aligns correctly.
That means re-populating the old parts on to the new barrel after the new barrel is headspaced and cross-pinned into the new front trunnion.

[SVT-40]

Is the rivet loose? If not, don't worry about it.