If you're going to purchase a NFA weapon then the best way to do it is to purchase a Secure Gun Trust, then purchase the NFA weapon with the trust. This offers you a multitude of advantages over purchasing a NFA weapon any other way.
Less Hoops to Jump Through in Your Registration with the ATF
Purchasing NFA weapons (aka Title II weapons) through a trust protects some of your personal information from being registered with the government. If you register with the Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE, aka ATF) as an individual you will have to submit a passport style photograph, and fingerprints with your application. If you register with the BATFE to purchase NFA weapons with a trust you can simply skip this step.
If you register with the BATFE as an individual, you will have to ask the Chief Law Enforcement Officer (CLEO) in your area to sign a statement that certifies that you can own a machine gun, silencer, or other Title II item. This requires you to put yourself out there with your local law enforcement as owning Title II guns, and depending on the area that you are in, a lot of the time you will simply be unable to get a CLEO to sign that certification for you. With a NFA Trust, you do not need to submit a CLEO signature with your BATFE application.
The Secure Gun Trust is Attorney Drafted Specifically to Hold NFA Weapons
Secure Gun Trust.com provides you with a trust drafted by an attorney that was specifically designed to hold NFA weapons and pass them to your beneficiaries. If you do not want your NFA weapons going through the court process known as probate when you die, then you can pass them through the complete privacy and seamlessness that a Secure Gun Trust provides. Furthermore, because the Secure Gun Trust was designed specifically to hold NFA weapons, it was designed so that the weapons are held in trust until the beneficiaries are eligible to receive them. Generic living trusts would have your NFA weapons pass to the beneficiaries upon your death, regardless of whether or not it would put the beneficiaries at risk of being in unlawful possession of a Title II gun. This trust was designed with that specifically in mind.
A Trust is a Completely Private Document
A trust has advantages over forming a corporation or LLC to purchase the NFA weapons. A corporation or LLC is similar to a trust in that those entities do not have to submit a photograph, signature, or obtain a CLEO signature along with the BATFE form. However, a corporation or LLC must be registered with the State, the registration documents are public, and they have reporting requirements. A NFA trust is a completely private document that never has to report to anyone.
Protection for Your Beneficiaries and Other Who You Wish to Use the NFA Weapons
A NFA Trust allows you to list close friends, family, or anyone that you trust enough to be a Trustee. A Trustee will be legally entitled to use and possess NFA firearms. If you registered a NFA firearm as an individual, you are basically the only person that can touch the NFA firearm. A NFA Trust offers protection to your loved ones who you choose to list as Trustees.