Here’s an oldie but a goodie that I noted last spring over at MO:
H.R. 1022: Assault Weapons Ban and Law Enforcement Protection Act of 2007, sponsored by Rep. Carolyn McCarthy (D-NY) and introduced in February, includes this:
Barrel Shroud – The term ‘barrel shroud’ means a shroud that is attached to, or partially or completely encircles, the barrel of a firearm so that the shroud protects the user of the firearm from heat generated by the barrel, but does not include a slide that encloses the barrel, and does not include an extension of the stock along the bottom of the barrel which does not encircle or substantially encircle the barrel.
Here’s the Congresspedia entry on HR. 1022.
And H.R. 1859: Anti-Large Capacity Ammunition Feeding Device Act of 2007, also sponsored by McCarthy, seems to have gone exactly nowhere since it was introduced in April.