The same thing happened with me. The magazine is nothing like the picture and I thought it would work my M83 because they look exactly the same, intil I got my R6, but it doesn't. I saw an add on Amazon that is selling an R6 with an M83 mag so I thought the R6 and M83 mags were the same. But I don't know intil I get my R6. I haven't used it yet but it's not weighted and works like a regular hi-cap magazine.