Also, most older Class 3 machineguns can be purchased with a C&R. You don't actually need a class 3 dealer and pay all his fees.All WW2 machineguns are covered. I bought my 1943 vintage M1 Thompson with a C&R and argued this point with a class 3 dealer. He said no way, but I have a duly registered full auto Thompson in my safe with all the papers and tax stamp.
You may also transport your class 3 weapon to another state that allows machineguns without telling the ATF. If you do not have a C&R license, you have to get specific permission to do this.
Big Larry