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On the FBI Ump lower do you have to replace the trigger, hammer, etc for the USC conversion. And is there the slot for full auto that you need to block? Wondering because their is only the 2 positions if they put it in there.

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Racer 27
 

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On the FBI Ump lower do you have to replace the trigger, hammer, etc for the USC conversion. And is there the slot for full auto that you need to block? Wondering because their is only the 2 positions if they put it in there.

Thanks
Racer 27
Even though the FBI lower only has two switch positions, it has the same cavity for the full auto parts as any other UMP receiver.
 
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