My dude, they made Bakelite mags for the AKM/AK-49, in fact the magazine on the guns in the picture have the proper level of curve to match these 30 round 7.62x39mm Bakelite mags. Also 7.62x39mm is actually just barely shorter than 5.45x39mm. It's a wider round, not a longer one, so they would fit in an AK-74 mag. Don't get 7.62x39mm confused with 7.62x54mmR or 7.62x51mm NATO (.308 Winchester). Those are full rifle calibers while 7.62x39mm, 5.45x39mm, ad 5.56x45mm NATO are all much shorter intermediate calibers.
I'm not confusing 7.62x39 (AK 47 / Simonov) with either 7.62x54R (a cartridge for Nagant / Dragunov) or a 7.62x51mm NATO (e.g. for M-14), I got it all cleared up here, and I also know that bakelite was used in the production of AKM mags (East Germany). What I didn't know about is the level of curvature needed for properly lining up/ nesting the 5.45x39mm rounds in a 74 pattern AK magazine; as I had just seen, you're right about that, this AK mag has got a similar curve to it, to match up an AKM magazine, or to at least imitate it... and yes, I know that the 7.62x39mm is shorter but fatter than the 5.45x39mm round - Warsaw Pact cartridge (which is a russian counterpart to the NATO 5.56x45mm round), it's just that I'm not sure whether the feed lips and the follower of an AK-74 mag; in this example an east German bakelite mag / Russian Iževsk 45rnd magazine, could reliably feed 7.62x39mm ammo... I heard there are problems with interchangeability in terms of feeding with AK74 mags between 5.56 an 5.45 rounds already, so I'm not exactly sure how 7.62mm ammo would feed from a 5.45 magazine. I know that certain 5.45 Sajga mags can't feed 5.56 ammo, so... The barrel though is thick enough.
Bakelite mag gang I've been thinking about making a model overhaul of the Chinese Assault Rifle so it actually looks like a 5.56 AK myself. Only problem is I don't know how to model ahahah
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Don't get 7.62x39mm confused with 7.62x54mmR or 7.62x51mm NATO (.308 Winchester). Those are full rifle calibers while 7.62x39mm, 5.45x39mm, ad 5.56x45mm NATO are all much shorter intermediate calibers.
I've been thinking about making a model overhaul of the Chinese Assault Rifle so it actually looks like a 5.56 AK myself. Only problem is I don't know how to model ahahah