Quote:
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A regestered rcvr will have the trigger group (incld the auto sear) held in by the trigger pins. Nothing can just fall out (as long as the pins are in place)
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Wrong
There are many Registered Receiver "M16" rifles out there that are SP1 or AR-15A2 that have a DIAS "married" to them.
for visual identification.
M16 auto sear
DIAS