The late Ian Hogg put that to print in Military Small Arms of the 20th Century at least in the 6th edition which I own about the Swedish metallurgy. The claim is the specifications were changed in the steel to suit wartime availability of steel in Sweden. It also is noted in the early 80's the 9mm Service cartridge they were using was hotter for use in submachine guns too that were in use led to cracked frames and the withdrawal of the pistols in exchange for the older m/07 Browning 1903.
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Dave
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