There are several type of Title II firearms that are restricted by the National Firearms Act.
Each state can impose additional restrictions on the sale, purchase, and transfer of Title II firearms by a class 3 SOT in addition to the compliance that is required with the national Firearms Act.
In Indiana you can own the following items that are regulated the the National Firearms Act
Other Weapon (AOW)
Destructive Devices (DD)
Short Barreled Rifles (SBR)
Short Barreled Shotguns (SBS)
In Indiana you cannot own the following NFA restricted items.
NOTE: as of July 2015 Civilians can own SBS on a Form 1 or Form 4
Follow this link to find out more about Indiana and NFA restrictions on Class 3 Firearms