Question regarding AR pistol

[Palmaris]

Can someone clear up if Thumb Stop will be legal on AR pistol?
Something like this

[nothinghere2c]

http://www.calguns.net/calgunforum/showthread.php?t=738680

hope this clears it up

[Palmaris]

http://www.calguns.net/calgunforum/s...d.php?t=738680

hope this clears it up

This thread clearing up angled forward grip, that's clear. I am talking about thumb stop.

[nothinghere2c]

This thread clearing up angled forward grip, that's clear. I am talking about thumb stop.

thumb stop, hand stop, they are very similar. hand stops are legal.

[SDM44]

thumb stop, hand stop, they are very similar. hand stops are legal.

This. They're all used to help with grip placement on and around the handguard.

A vertical fore grip can be used as a separate grip that your hand grabs onto, rather than to the "gun itself" (handguard).