FWIW, I often purchase parts from Numrich, aka GunPartsCorp.com. Recently I saw a receiver I was interested in, but Numrich's ad said that the part was not for sale in CA. The receiver was a commercially made Mauser 98 style receiver, and perfectly legal to sell and own here in CA.
I contacted Numrich and asked why the recevier could not be sold to CA. Here is their reply:
"We are aware that firearms can be shipped to CA. However, it is our company policy not to transfer any FFL items to CA. This policy is not based on any particular State regs; it is strictly our company policy. We apologize for any inconvenience. If you have any questions, you can call us at any of the numbers listed below between 8am to 4pm EST, Monday to Friday.
Numrich Importing, LLC
Customer Service: 845-679-4867
Orders: 845-679-2417
Toll Free: 866-NUMRICH (866-686-7424)
If you have any additional questions, please feel free to email us at importing@gunpartscorp.com.
Sincerely,
Numrich Importing
Customer Service: 845-679-4867
Toll Free: 866-NUMRICH (866-686-7424)"
While I realise they can establish whatever rules they want, I have decided they will not longer get my business. I am sure I can find most of the parts I may ever need other places.
I contacted Numrich and asked why the recevier could not be sold to CA. Here is their reply:
"We are aware that firearms can be shipped to CA. However, it is our company policy not to transfer any FFL items to CA. This policy is not based on any particular State regs; it is strictly our company policy. We apologize for any inconvenience. If you have any questions, you can call us at any of the numbers listed below between 8am to 4pm EST, Monday to Friday.
Numrich Importing, LLC
Customer Service: 845-679-4867
Orders: 845-679-2417
Toll Free: 866-NUMRICH (866-686-7424)
If you have any additional questions, please feel free to email us at importing@gunpartscorp.com.
Sincerely,
Numrich Importing
Customer Service: 845-679-4867
Toll Free: 866-NUMRICH (866-686-7424)"
While I realise they can establish whatever rules they want, I have decided they will not longer get my business. I am sure I can find most of the parts I may ever need other places.

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