Originally Posted By sandboxmedic:
As far as I'm aware you should be fine although there is that new video with the ATF director saying they'd prosecute for something or another, add on charge or something, I didn't really pay any attention.    On pistols, you aren't suppose to use a vertical grip, so what you posted should be fine as the retarded rules are written.  I use the BCM Gunfighter Vertical Grip, because it isn't actually 90 degrees.  I use them on several guns including a Mossberg 500 but I have reduced range of motion in my left wrist so it's a work around for me.