RE: Thought I'd Post A Pic
Metal, Some areas wont allow more thena 10 round mag to be sold with handguns and there are also few that wont allow more then a 10 round mag in any pistol. Thats prob why you got a 10 rounder instead of the 16 it was saposed to come with. I had a SW40VE that came with 2 14 round mags.