Magpul PMags fit perfectly in my VFC Scar, so do the ICS hi cap polymer (plastic) ones.. I've also tried all of them in a VFC SR16 and they all work...I haven't tried any others as of yet.
Hope that helps.
The Tier One Tactical Operator
Tippmann Arms M4A1
KWA USP .45, KJW P226, KJW hi-cappa