Quick AR pistol question

[lear60man]

I swear I have searched the entire site to no avail

Why does an AR pistol need a bullet button? My other pistols dont need them.

[Paper Boy]

Short answer. Because the mag is outside of the grip.

http://www.calguns.net/caawid/hgflowchart.pdf

[glockwise2000]

Short answer. Because the mag is outside of the grip.

http://www.calguns.net/caawid/hgflowchart.pdf

[EBR Works]

....and they typically have a threaded barrel. Mag outside grip or threaded barrel on a pistol = AW. A BB nullifies the AW status.
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[lear60man]

learn something new every day I wasn't aware of the mag outside of the grip law. Man that flow chart is good.

Thanks!

[tenpercentfirearms]

Most AR pistols have a detachable magazine and three evil pistol features. Magazine well outside of the pistol grip, threaded barrel, and barrel shroud. When it is no longer a detachable magazine pistol, then those evil features don't matter.