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What about using an sar2 as a donor rifle?
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Romanian 5.45 barrels are a special snowflake with a funky outer diameter that isn't shared by any of the other 5.45 pattern guns so you couldn't reuse it without shimming everything in your build and that'd be sloppy. You'd have to remove the front trunnion and replace it with a Krink front end anyway, as the rear sight block is different, on top of replacing the rear trunnion for a folder-style one. The resulting rifle would have a nice Romanian receiver and you are no closer to your goal than just buying a NDS receiver for $115 that was precut for everything.
The M92 receiver will need all sorts of unwholesome modifications to fit 5.45. The only time it makes sense to convert a 7.62 receiver to 5.45 is for a registered machinegun conversion.
"Krinkov" (true AKSU clones anyway) and "cheap" don't go together. Buying a 104UR at least already gets you to 922R compliance out of the box, and it's a factory AKSU. Factory. Something like that hasn't been available since, like, ever. Get the 104UR, pay the $200 tax, and cut the barrel off. You are already close to $1000 with your pile o' parts - stalk the EE, 104URs turn up relatively frequently (for now) around $1100-$1200. The extra $200 will be well spent.
I walked this path and ended up with 106UR and 104UR SBRs. It doesn't make sense any other way, unless you got in on a Chief Thunder kit a million years ago, or lucked into a complete Russian kit when they were slightly less rare.