Im trying to build a 5.56 AK. Barrels are in short supply lately, and I'm having difficulty finding a front trunnion and 5.56 barrel that match. I don't have a lathe (yet! its on the to do list), so I really need them to match. I have a few sources for trunnions, but none of them specify the chamber dimensions, so I don't know which one will fit the barrels that are still in stock. Do any of you have access to resource that lists the barrel and/or trunnion chamber dimensions for the various AKs that are out there? The barrels I know I can get are designed for milled Russian AKs, if that helps...
Have you tried contacting the source where you've found the trunnions? They may very well have cross-reference charts they can refer to...