Great product. Makes my magazines mine!
I did a metal AR mag and an Israeli Galil AK mag. (For those that are not familiar with the Galil, the mags are shaped very much like our M16 mags.) I had to custom shape the Galil Gunskin to the mag but it came out great. the AR mag was no problem either.
I have several more to do.
There is a learning curve but it is not bad.
I highly recommend you spend the bucks and get the installation tool. I use a piece of a model sprue. It worked but their tool would work better. And a small heat gun is in order also.