Hogg & Weeks (p. 190) has it that the Swedes modified the design of the pistol slightly (it is implied that they eliminated the recoil accellerator, among other things), and used different steel from that spec'ed in the original Finnish design. That, and the designation of a high-power 9mm smg round as the standard service ammunition, which started the serious cracking problems.
--Dwight
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