Yeah, they're quite neat. A spring loaded button the left pushes the leaf aside so you can move it, when released it locks it into grooves on the base corresponding to your various ranges. There's even a cutout on the handguard so you can flip it all the way down and expose a fixed battle sight on the base, which is an unusualy large notch - put the blade at the top of the notch and it's good for 200M, at the bottom 100M. The later M38 series operated with just the fixed sight, which I think is plenty good enough for most combat ranges!
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