I figured as much. See the thing is though I've heard mostly great things about the boxed PMAGs, even the EMAGs. Only con I have heard about them is on some rifles there is a slight wobble, but that's most M4's for ya. I had my attention dramn to these ones as well:
http://www.shrikeairsoft.ca/upgrade-...category_id=24 . Hard to tell, what do you think?