[1_Inch_Group]

It is...the serial numbers stamped are required to track the sale by a manufacturer.

Build your own and it doesn’t require tracking, because you manufactured it (albeit by buying a 90% lower) and aren’t transferring it.

[headstamp 2]

Sounds excellent then.

I always thought the receiver had to have a serial number.

[Lazamataz]

Build your own and it doesn’t require tracking, because you manufactured it (albeit by buying a 90% lower) and aren’t transferring it.

80%. A 90% lower requires a SN.