This is a question that we get asked frequently, "Is my Texas Gun Trust Valid in Other States?". The answer is yes. Whether you initially setup your gun trust in Texas, Florida, Arizona, etc, you are able to amend your gun trust to change the gun trust to a different county and state if you wanted to.
Yes, you can transfer your "individual" tax stamp into a gun trust, corporation or other legal entity. However, since you are transferring the NFA firearm from one entity (yourself) to a different entity (your gun trust, corporation or other legal entity), you will need to pay the ATF the $200 tax stamp again.
Yes a tax stamp is different from a gun trust. A tax stamp is the actual proof of registration of your NFA Firearm. A gun trust is the applicant that is applying for a tax stamp and will become the owner of the NFA Firearm when the tax stamp is approved.