What is wrong with a 20 round mag? one shot one kill, it really doesn't matter what you have a "spare". And when you add Mag Pul stocks you don't have full auto, you have a "bump fire". You can do the same thing with a Mossburg pump slug gun, just hold the trigger back as you pump the gun IT WILL GO OFF.
ATF rules that the configuration you speak of IS NOT full auto. You have to play/manipulate parts inside the trigger to get to full auto.
Fully auto will mean each person owning that rifle will need a tax stamp......$200.00 and at least six month waiting period, not going to be an issue.
Think of the old cowboy rifles that will now be legal...... a bunch of black powder rounds we have not been able to use!
Bunch of fear over nothing, we just evened the playing field..........lol. .308 pistol has been legal for years, I've seen what it can do to deer at over 100 yards.
When science meets tradition there will be sparks.....
