There are several type of Title II Firearms sold by Class 3 FFLs that are restricted by the National Firearms Act.
Each state can impose additional restrictions on the sale, purchase, and transfer of Title II or NFA firearms in addition to the compliance that is required with the National Firearms Act.
In Vermont you can own the following items that are regulated the National Firearms Act
Machine Guns Any Other Weapon (AOW)
Destructive Devices (DD)
Short Barreled Shotguns (SBS)
Short Barreled Rifles (SBR)
Suppressors (as of July 2, 2015)
In Vermont you cannot own the following NFA restricted items.
Prior to July 2, 2015 Vermont did not permit suppressors and had a $25 penalty for anyone who manufactures, sells, uses, or who possesses a suppressor intent to sell or use.
Follow this link to find out more about Vermont and NFA restrictions on Class 3 Firearms