This is an entirely new thread that you are asking about. This discussion can be found all over the interweb.
Basically you have to find out if it is legal to own an SBR in your state. If not, your question is answered. If your state allows it, you fill out an application, get fingerprints, background check, Chief Law enforcement signature, send it to the ATF with $200 and wait 4-6 months for an approval. Then comes the cost of the conversion. Do a little more research...