QUOTE: As long as you ignore their cost compared to the surplus $8-10 AK47 or $12-15 AK-74 mags. Thats the main issue, the "minor" fitting is fine as long as you expect to use them in only in your one gun.
How many mags are you gonna buy for one rifle? I don't see '47 mags that cheap, maybe $15-20 around here...nor '74 mags cheaper than $20. Aimsurplus had them for $20, now they're out. And yes, I only expect to use them in one rifle. KVAR has Bulgarians and Numrich has Galils, both for around $30. If you like steel, go with Weigers for $30. Lots of choices.
QUOTE: Didn't have this issue with the AK74 mags in my 5.45x39 Saiga conversion.
'74 mags will lock up fine in the Saiga, but won't reliably feed without the guide. So sez me and several folks on the Saiga forum. I did some extensive testing with available ammo, even some home-made HPs from FMJs.
The Bulgarian WASP or Russian 7N6 are the only effective rounds in 5.45x39 and although accurate, they are corrosive. If I could find Barnaul 55 soft point, I might reconsider the '74.
As for the .223, load up on steel case Wolf 75hp (very accurate) and Silver Bear/Brown Bear 62 SP/HP and forget the brass. BTW, a strip of door molding from AutoZone will fix dinging brass issue. The Saiga in 223 has better long range accuracy than the x39 and is just as effective if not more, at distance, IMO.