Much ado about almost nothing...
More smoke to bamboozle the low-information voter, and make him/her think something is being done about urban violence when Obama's administration is pretty much impotent because of it's own constraints.
M1 Garands and M1921 Thompsons are just not weapons being used by today's urban gangsters (who look like Obama's son. If he had a son.) I think it's yet another attempt to impinge upon out Constitutional rights, but from a practical standpoint, the effect should be almost nil. (Unless you are a collector. Then your stock of Garands is worth more than it was yesterday!)