It appears that you are basing all your decisions on looks. There is nothing wrong with that as long as you know and accept that. I wanted a short AR. I looked at all the options and decided to buy a 16" with the standard fixed stock (Bushmaster). The reasons have all been posted already;
1) The real collapsable stock looks cool but in reality is not a good stock from a shooting standpoint. In addition, the amount that it actually shortens the weapon when collapsed is only a few inches. Considering the fact that the post ban one's are fake anyway, there is no reason for me to buy an inferior stock that doesn't work anyway.
2) I agree that a flash suppressor looks cool, but I don't really care if my flash is suppressed. I am not an armchair commando, I shoot my AR on a range and hunt with it. A muzzle brake might be nice on full auto, but on my semi-auto it has no legitamate purpose and makes the gun much louder. Last but not least, instead of having a cool looking muzzle brake, I would rather have two more inches of barrel to give me more real bullet performance (not looks, real). If you look at the 16" OAL rifles with a brake, the barrel is 14" with a 2" muzzzle brake added to bring the barrel up to a legal 16". If the barrel needs to be 16" by law, why not make that whole 16" real barrel so you get all the velocity you can from the cartridge ?
3) As I said, I wanted a short AR. I was pretty much set on buying an M4 clone because they look good. Aside from the fact that the collapsable stock doesn't collapse and the fact that the barrel is 14" with a muzzle break I was going to buy one knowing it was all show but no go. Then I read the specs. The Bushmaster M4 close is actually 2" longer than my 16" shorty.
Case closed.
One thing to keep in mind, there is no ban on selling these parts. In fact you can pretty easily buy the M16 parts to make your rifle select fire. You can buy pre-ban stocks and you can put them on your rifle................... What keeps people from doing it is the prospect of becomming a felon, losing all their guns and property, losing thier job, losing their freedom. Odds are, no one would ever know, but is the risk to reward ratio good enough to try it for a collapseable stock ?
"Muzzle brakes also seem to be a personal preference issue. Firstlt they're secured with set screws with a little bit of blue loc-tite. If you try it and don't like it with 60 seconds and an Allen Wrench it's gone. "
Most post ban muzzle brakes are permenetly attached to the barrel. You can't take them off without cutting off the end of the barrel. Note that if removable, on many ARs this would result in making a short barreled rifle; another felony (barrel shorter than 16")