The differences, off the top of my head, between the ag42 and the 42b are as follows.
Added the rubber brass bumper to save damage to brass for reloading
Added those two lumps on the dust cover to facilitate manipulation with gloved hands. Previously there were just serrations.
Replaced the gas tubes with stainless steel gas tubes due to corrosion issues with the original gas tubes.
Added a secondary magazine catch due to issues with magazines being blown out of the gun with older ammunition of a slower burn rate.
Those were the major changes that I can recall without looking it up.
I'm fairly sure that of the 30k AG-42's made they were all made as AG-42's originally in the span of 43-44 if I have the years right. They were then converted in the early fifties, and the swedes did a rather thorough job of it. I don't believe any were manufactured originally as AG-42B's, but I've been wrong before.
Unconverted AG-42's do exist, as do AG-42b's converted to .308 for the switch into NATO. But both are extremely rare commanding very high prices. I believe there is one .308 AG-42 living in a museum in Sweden, and I've seen photos of at least one unconverted AG-42 in the states, but don't ask me who has it.
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