Some more further information to add.
It looks like for any manufacturer data older than the 2011 offering on the ATF site, it gives a comprehensive breakdown of how many firearm types each company manufactured.
I opened this one up:
http://www.atf.gov/statistics/download/afmer/2010-final-firearms-manufacturing-export-report.pdf
While this isn't exhaustive, I've included some "assault weapon" manufacturer names I recognized off the top of my head that exclusively make assault weapons. There are some manufacturers with military contracts and also make more than assault weapons, like FN and Remington. I did not include them for simplicity. The actual number of evil black rifles manufactured is much higher than my rough list I cobbled below because I am mainly familiar with AR15 manufacturers, and not the AK-style manufacturers or otherwise.
Smith & Wesson 100051
DPMS 46891
Bushmaster manufactured 40679
Rock River ARms 23200
Stag Arms 19545
Colt manufactured 11175
Armalite 9562
DS Arms 8001
CMMG 7663
Del-Ton 5676
Bravo Company Manufacturing 5380
Lewis Machine & Tool 3553
Olympic Arms 2892
Daniel Defense 2413
Barrett 1472
Knights Armament Company 1399
Palmetto State Armory 1363
Mega Arms 1167
Sabre Defence 1194
Patriot Ordnance Factory 947
Noveske 748
294,920 evil black rifles manufactured out of a total of 1,830,556 rifles for that year. 16% of all rifles manufactured, based off the incomplete list above were assault rifles. It wouldn't be unreasonable to guess around 20% of the rifle market to civilians are assault rifles, if we could compile a complete list.
Considering shotguns (743,378) and pistols (67,929) and rifles (1,830,556) total 2,641,863 firearms manufactured with this specific data, assault rifles manufactured, based on just the incomplete list above, 11% of ALL firearms made. One in ten firearms sold across America might very well be an assault rifle. Despite the disproportionate attention in the media, the incredible proliferation of these scary guns in the hands of Americans has placed this specific style of rifle into the category of "rifle" (along with all other rifles that aren't "assault), which according to the FBI, cumulatively is responsible for 2.75% of all homicides, the least used method in carrying out a homicide.
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Also there was some new information from the CDC data I posted on page 1. I was curious why "legal intervention" deaths were only 395. Right below it, it lists "Events of undetermined intent (Y10-Y34,Y87.2,Y89.9)" with 5,005 deaths. Given the CDC just records the annual deaths, it's quite possible these are "deaths in queue" undergoing active investigation or a court case at the time to determine if they were self-defense or not. Clearly some of these cases or investigations can take time. Obviously once these cases are settled, they won't be re-categorized into the proper category in the next year's CDC report.