Before the ban, I had one of each - the real deal Finnish Lahti and the Husqvarna version. I shot them both a LOT, as they were the only ones I had ever seen here in UK and they attracted a lot of attention from fellow shooters. The DAG 124gr ammuntion was great to shoot in both guns, and since I was a 'minor unit' all by myself, I had 27500 rounds of the stuff issued to me every year.... As such it was not worth me buying or reloading for them or any other of the numerous 9mm pistols I had at that time, except my Lugers. My only FTF were when using the lighter 115gr bullet, particularly in the Lahti, which had a somewhat stiffer action - maybe because of the bolt accelerator that was absent on the M40. Jarkko's point about the slide being a weak spot seems to be a failing in the Swedish version, rather than the original Finnish pistol which always seems to me to be a better item all round from the actual manufacturing POV.
Both are now long gone, but I have fond memories of beating Swedes and Finns with their own guns when I was based in Cyprus.
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