As I understand it...
Everybody started WW2 with 20 and 50 round magazines, the 100 round ones having been found impractical. Both types would fit the 1921 and 1928 gun variants.
When the M1A1 was introduced, it wouldn't take the 50 round 'L' drum mag, so users were limited to the 20 round sticks, and there was a lot of complaining about the lack of fire volume, so the US introduced the 30 round stick which became very popular. I haven't seen a wartime photo of two 20 round sticks taped back to back but apparently it was quite common.
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Gordon, in Scotland
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