I did some searching and it appears that a pistol (barrel less than 16”) and an over all length of greater than 26” can have a forward vertical grip. True?
My AR pistol (10.5” barrel) is 26.25” OAL including the buffer tube. I think that would apply as it is part of the original configuration.
My PAP M92 is 19.5” OAL, 26.5” including the SB47 wrist brace. This would not apply to said rule as the SB47 brace was not part of the original configuration.
Reference:
https://johnpierceesq.com/can-you-add-a-vertical-fore-grip-to-an-ar-pistol/
My AR pistol (10.5” barrel) is 26.25” OAL including the buffer tube. I think that would apply as it is part of the original configuration.
My PAP M92 is 19.5” OAL, 26.5” including the SB47 wrist brace. This would not apply to said rule as the SB47 brace was not part of the original configuration.
Reference:
https://johnpierceesq.com/can-you-add-a-vertical-fore-grip-to-an-ar-pistol/