I learn a lot of stuff on this thread - I gotta ask WTF is a bullet button?? Was this just a California thing ??
California and New York I think. In the states definition of an "assault" weapon they had a list of "evil" "features" things like a pistol grip, a thumb hole grip, a forward grip and a bunch of other things. if a gun had any of these features AND a removable magazine it was an assault weapon and you couldn't have it
the gun people quickly came up with a way to get around this they invented a magazine release where you needed a "tool" to get the mag to drop out basically it made the mag release button recessed so that it couldnt be pushed with your finger with an AR and its more pointed bullets typically the tip of a bullet would be able to push it in which is why it became known as a bullet button - because you needed a "tool" to get the mag out under the law this made it a fixed magazine and it was no longer an illegal assault weapon
recently California changed the law so that a bullet button was no longer good enough to be considered a fixed mag as such I either had to make it "featureless" or register it - under the rules simply putting a fin grip wrap around the pistol grip makes it no longer a pistol grip so thats what I did and I also removed my forward grip - now I no longer had an assault weapon, but it still had the stupid bullet button - - since I no longer needed it Hi=Point was kind enough to send me the regular mag release parts so now I can release the mag and change it by just using my thumb
here is a picture of a bullet button on an AR - as you can see it is recessed so you need a bullet tip to push it (my gun is a 9mm so a bullet never fit in the hole I had a small tool on my key chain I used)
Personally its all very stupid - they base what an "assault" weapon is on how it looks - no one in their right mind would ever consider my 9mm an "assault" even if it had 400 rounds in one mag it still wouldnt have enough stopping power for any one to ever want to use it in combat