Dry-firing.
22 stages starts tomorrow. Each competitor is required to carry everything with them the entirety of the two days. Once you're in the compound, they lock the gate.
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Well hell,..the night got all eaten up already.
TGIF...have a good one bitches.
There's an NFA forum here.
Confused by your question.
In general from what I think I know:
Short (<16") upper can run on pistol lower or (form 1) SBR lower.
SBR lower can run original stamp length or (temporary) longer or different cal. upper.
Suppressor (form 4) is a separate issue.