There is ONE thing that surprised me - I now have a USE for AK mags with NO metal in the tab area. While I've not heard it is a real problem, the AR was NOT made for an AK magwell, and the aluminum lower is more prone to wear with steel tabbed/reinforced mags. I get that good ones have a steel pin up front to mitigate this, but the rear lockup in part puts steel against SOME Aluminum. So... using all plastic mags eliminates this and they are cheap. I have plenty for serious use.