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Originally Posted by JohnKSa
The semi-auto needs a separate firing pin, a disconnector, and generally a fairly complicated trigger system.
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A home-made semi-auto doesn't need a firing pin any more than a home-made full auto. Easy enough to build an open-bolt semi-auto, although as you said the trigger system is slightly more complicated, requiring at a minimum one extra part for a disconnector.
However, if you're talking about building an ATF-approved LEGAL semi-auto - then it will require firing from a closed bolt and thus a firing pin.