under the National Firearms Act, as are grenades (10-year felony to possess either without a Form 4). Civilian collectors can get 37mm safety flare guns dressed up to look like M203's, but they're fake. There are antique rifles with smooth muzzles designed for launching (NFA restricted) finned grenades using a blank cartridge, but no modern rifles that I know of. I guess you could launch potatoes with one.
The Feinstein law exempted most rifle magazines, but even so, the cutoff for what it defined as "large" was Civil War era--only 10 rounds (15-round lever actions hit the market in the early 1860's). If they set the cutoff at 30 rounds, it would have been less laughable. Bayonet lugs are moot, as I've never heard of a single murder committed with a rifle-mounted bayonet (the hole in the end of the barrel is the dangerous part); collectors care, I don't particularly, but banning them makes little sense to me. Flash suppressors redirect the muzzle flame downrange instead of having it flare in your face with every shot (annoying on a target gun, more than annoying on a defensive carbine); I've shot a 16" barreled .223 without a flash suppressor, and it was unpleasant. I don't have a flash suppressor on my SAR-1 (7.62x39mm), but I'd want one on a .223.
There is a deep divide at the national level over the gun issue, with a lot of people supporting Howard Dean's leave-it-to-the-states approach that worked well in 2006, but there are elements within the DLC that are still pushing hard for a new AWB along the lines of H.R.1022, and I think they have no idea just how sweeping such a law would be. The 1994 Feinstein law was annoying, but it didn't really do much except raise prices on replacement magazines for 9mm and .40 caliber pistols, and hardly touched rifles at all. H.R.1022 (current AWB before Congress) would be a lot worse, banning the most popular rifles in America outright, among other things, and passing that would be very, very bad for the party at large, IMO.
FWIW, I wrote the following after the '04 loss; I think it was largely vindicated by Dean's approach to '06, and the results thereof. You may not agree with everything in it, but it at least may help non-gunnies understand the issue a bit more, and where gun owners are coming from.
Dems and the Gun Issue - Now What? (2004)