AR-22 and MP5 Magazine Clamp

[srnm]

I was wondering if anyone knows if these magazines ( http://www.armseast.com/store/index.php?p=product&id=151 ) are the same size of acutal ar-15 magazines because I am wanting to attach a magazine clamp to them, also wheres the best place to buy cheap ones... now this may get me banned from the black and green rifle forums, but I have an mp5 bb gun, the closest thing I can get to own a real one cause i dont have my prohib license, but i want to get a clamp for the magazines for it aswell so does anyone know the measurements for the real mp5 magazines are and where to get clamps for those, thanks

 

[dangertree]

Yes'Sir. Same dimensions.