OOW: 500
Dtechnic/CZ USA: Unknown
Ohio Rapid Fire: Unknown
CNC Warrior: Unknown, but usually they do receiver runs in relatively small quantities. Guesstimate <500.
Century:
1st Gen, VZ0011XX (~1,100 Lowest serial number in this thread)
1st Gen, VZ052XX (~5,200 highest serial number in this thread)
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2nd Gen, VZ08 - 003xxBR (~300 highest serial number shared in this thread)
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3rd Gen, VZ08pm - 0014x (~100 Lowest serial number shared in this thread)
3rd Gen, VZ08PM - 01089x (~10,800 highest serial number shared in this thread)
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Custom Builds/Parts Kits: Unknown