Update on mine
Well I got the ATI Magazine extender in.
The install wasn't as straight forward as I had expected but I figured it out. I had read a while back that the tabs that hold the cap at the end of the magazine tube had to be drilled out so I did that and then cleaned up the inside with my dremel tool. The spring had gotten bent up a little before I went to install it but I don't know if I did it or it came in the package that way.