Originally Posted by BrokenBird
When talking about magazines does ICS require only ICS magazines?
I just picked up 5 used TM M4 mags and they work great in my ICS. They catch a tiny bit at the back of the mag when it's half way out of the receiver so I'm gonna file the edge down a bit. But other than that, no feeding problems, they clip in nice and snug and don't wobble at all.