Quote Originally Posted by merl View Post
"no sir that is not a 30 round mag. it is a 10 round mag and an extension
Uh, ya. That's what he said in the OP. They are mag extensions with a collar to couple the extension to a Pmag. They used to make the collar out of aluminum. IMO, you are better off putting the money toward a 60 round Surefire mag, but the extensions do work. I have both the extensions and the Surefire mags.