upgrading frame/receiver certificates
As already mentioned in the small print at the top of the sheet your registration is printed on are "the conditions"! After doing 3 lower receiver builds and obtaining upper assemblies for each I called CFC to ask how to update my certificates. They in turn put in touch with the firearms technical section, they get your information i.e. barrel length, mag. capacity, etc. and then in a not so timely fashion update the reg. cert. to reflect the new completed firearm.
I was recommended not to take completed builds to the range with only a frame/ receiver cert. as it could be open to many interpretations depending on who started asking the questions if you met with the authorites.
Have received one new certificate and still waiting on the other two. At one point the CFC asked me to have them verified but as I was a verifier before they cut me some slack in that area.
Regards,
Mark -beaver455