Don't know where you get your info, but full auto firearms and sound suppressors are not and have NEVER been banned. If you live in a state where state law so allows (I live in FL and it's a-okay here) and you follow the right steps in securing a TAX STAMP cost of which remains as it always has at $200, you can own one as well. IIRC it is either BATF Form 4 or BATF Form 1.
Any full autos made after 1986 are banned, thanks to a last minute amendment, probably improperly passed, to the Firearm Owners Protection Act. Consequently the supply of transferable full autos is fixed, or very nearly so. Since the demand is not fixed, the prices of pre '86 full autos has gotten completely out of reach of the average person.
Not sure how you extract “suppressors” from “full auto”.
The grandfather clause in 922(o) serves only to confuse people like yourself to avoid Constitutional invalidation. If you will slow down and think for a moment, you will realize that the men guarding Jimmy Carter are NOT using the “allowed” 20+ year old, used, out of date, wildy overpriced relics with more collector’s value than tool value, those men are using post-’86, new, affordable, tools which you CANNOT buy legally at any price. My post was, in context, exactly correct. (Yes, I know those laws well.)