I wish I could answer you question Wes, I don't know either. I don't want one. I know lots of folks that collect military arms but they have the special FFL licenses for auto weapons etc. However those folks (mainly retired army officers and or sheriffs) aren't about spraying folks they are just collectors and do have the very hard to get special license. For me, what is the 100 round drum for .. I don't want one. I don't like seeing them sold either