Vertical Fore Grip on Carbine

[Surgery]

Hello,
I know this forum is usually for questions about concealed carry of handguns but I thought it might a good place to ask this question as well. I have a S&W M&P15 and was curious about putting a vertical fore grip on it. I've looked at the NRA-ILA summary of NY laws and saw nothing about VFGs, and also noted that some gunstores in the area sell guns with VFGs on them. I was %100 sure it would be fine until an acquaintance said he was pretty sure they were illegal, and that the NRA-ILA website might be out of date. Wanted to know what people more knowledgeable than both of us might have to say on this. Thanks.

[RottenII]

Perfectly legal.

[Surgery]

Thanks for advice guys. I called a local, reputable gun shop and they told me the same thing, so it looks like I've got the green light to go ahead! Thanks again.