From Silencer Central.
Class 3 License for Personal Use
Because a Class 3 license is for commercial use only, it is not legal to get one for personal use. However, that doesn’t mean that if you have a Class 3 SOT that you cannot acquire NFA items for personal use with it. Personal use of a Class 3 license has to be incidental to your regular commercial activities.
What does that mean? It means that if you appear to be using your license to just get NFA items for yourself and family members, you are going to lose your license about as quickly as the ATF figures that out from looking over your books.
Remember too, it is a fallacy that you need a Class 3 license to buy or possess NFA items. You only need it to sell them commercially. Private citizens require no special license to purchase a silencer or other NFA item. They just have to pay the tax. The one vague exception to this is that a small handful of states only allow ownership of NFA items if they are on the ATF’s Curio and Relics list and the buyer holds an 03 FFL.
So in short, don’t go through all the hoops of getting an FFL and SOT just to use it primarily for personal use. If you plan to acquire a lot of NFA items for yourself, consider keeping them in the name of your business or putting your business on your trust, and designating them as demo, or test, or rental items for your customers
So even if as you say, get a Class 3 FFL, it will still be a no go for personal use only, must have a business.
I don't know where you are but state laws do vary on this, but I think its pretty clear that WA is one of those states where the exceptions are very few, and full auto is essentially unobtainable but for police, military and manufacturers., just having an FFL,, ANY FFL is not enough.
I don't want to argue about this anymore and especially since we stepped all over Philips thread, sorry about that Phillip.