Also, I can confirm that AK-47-type magazines will not seat properly in an AK-74-type receiver, nor vice versa. Steel '47 mags are too wide. Bakelite '74 mags are too long. So getting 5.45x39mm magazines into a receiver that started life as 7.62x39mm is going to require grinding on the mag "well" and rework of the magazine catch, and even after that you're going to see some lateral wobble that will make feeding rather unreliable.
YMMV.
- C.
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