Help! AR Stoner Foregrip Question!

[Seenterman]

Hey I just ordered a vertical foregrip from Midwayusa.com it came in the mail yesterday but when I opened up the package no screws, or mounting hardware was included.

Heres a link so everyone can see what it is.
http://www.midwayusa.com/viewProduct/?productnumber=789062#enlarge

I know I need a rail, I already have a single rail mounted to the stock hand guards. The foregrip just slides onto the rail with a hole on eathier side of the lips (??) that grab the rail. No screws, no nothing. Did I just buy a $41 piece of plastic? I called Midway last night the lady I spoke with was very friendly but she was unable to find out from the parts dept. if the foregrip comes with screws; she said that she put in a request (?) and that she would get back to me next week. Thats a bit long for my taste and I want to know now if I eathier go buy screws for the foregrip myself, or are screws supposed to be included and send it back to Midway.

If anyones had experience with this exact foregrip any comment would be greatly appreciated.

 

[The Swede]

You have to loosen the big screw on the very bottom of the grip. Slide it onto the rail, make sure it is centered with one of the slots on the rail, and then tighten down. The big knob on the bottom of the grip is the screw.

 

[Seenterman]

Im pretty sure that wont work. Only because I slid it on, played around seeing where it looked right, and slid it off. All with that big thing screwed all the way in. Im pretty sure it cant screw in more but I'll try it tonight.

 

[The Swede]

Hmm, that is interesting. What kind of rail is on your rifle?