Originally Posted by nonamehaveI

ATF classifies rubber bands as illegal machine gun parts.

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Originally Posted by strobro32

The Tech branch has classified a particular shoe string design as a MG. I've seen a determination letter that said a rubber band in not a MG. Can't find it right now.
bump firing http://jpfo.org/images02/batfe-lee-bumpfire.jpg

Bump firing is approved method. Rubber bands are often mentioned in multiple letters as an approved method of bump firing.

shoestringhttp://jpfo.org/images02/shoestring.jpg

Of course... determination letters are only relevant for the owner of the letter and they can change their position with every letter. Letter writing is frowned upon in the NFA world. Asking the BATFE for these determination letters is making them create policy/law.

The BATFE is an agency who gets to be all three branched of the gov.