When I went to HK's armorer's school, one of our classmates repaired clocks and he said the 3 shot burst mechanism of the HK was very similar to a clock with the hammer being the pendulum. The regular full auto trigger group was very simple. Our instructor would not even touch the set-trigger group for the HK PSG-1.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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