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I'm re-thinking this...
So I started reading around, and started looking at the ballistics. 7.62x39 looks to be a better cartridge, maybe 200-300 more ft-lbs. Lot of people have issues. But a search brought up people that have made it work.Apparently, the split M4 feed ramp is the issue. And the other suggestion is dedicated 7.62x39 mags. Standard lower works.
Looking around at 7.62x39 complete upper. $251 for one that works, designed with a AAC BLK type feed ramp.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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