Turn Barrel or Ream Trunnion?

[bushflyr]

I picked up a PMKMS kit from global a bit ago. When it came, the trunnion slid on to the barrel slid on to the barrel with just finger pressure. I sent the trunnion back and global replaced it with an undersized new unit. (Great customer service BTW) But, the problem now is that the new trunnion is REALLY undersized, .76 vs .907 for the barrel stub. Am I better off turning down the barrel stub, or reaming out the trunnion?

[dougjones31]

I would get the correct trunion.

[flashx]

What Doug said flashx

[Rule .308]

I have to agree. The Bulg (ak74) trunion I have laying on my desk measures up at about .867. You're talking about a .150" difference. I would try using some more of Global's outstanding customer service to see if you could get the correct size trunion. As far as which one to machine if you do go that route, I would machine the cheaper of the two. Bore out the trunion to within a few thous of the desired size and then either finish ream it or lap it to the correct size.

[justashooter]

same kit from joeken comes with a .001 interference fit. matching numbers. like new.