Great magazines. The best feature is honestly the price: $10/mag for these faux PMAGs. Considering PMAGs are $25-$30 each, you get six of these for two of those.
They are incredibly durable (much better than MAG brand magazines) and they are pretty much duplicate designs of the PMAGs. Textured grip, removable bottom plate, Ranger Plate-compatible. They also have that removable sleeve feature (too bad there are no other sleeves out yet). One note if you have Magpul mag assists, the Magpul sits LOWER than they do on regular magazines because of that bottom plate. So if you do plan on using them, your loop (that you pull your magazines on) will be a tad smaller. For this, if you don't mind spending the money, Ranger Plates would be "more compatible" but, again, the Magpuls will still work fine. They fit like a glove inside KWAs; slight wobble, but you want that so it's easy to pull the mag out.
***Anyways, great all-around magazine but with ONE major flaw. They don't feed into my own KWA KM4 SR-10 nor my brother's KWA KM4 RIS. Yes, these magazines are made by the same manufacturers that make our guns and they don't even feed into EITHER of our guns. Mind you, our KWAs are from 2011 so KWA may have modified something with their feed ramps or something that don't make them compatible with these 2012 magazines. They fit perfectly, but they don't feed right.
However, I did end up finding an EASY fix if you don't mind opening up the magazines. The reason they are not feeding is because the "BB stopper" (this is what I'm going to call it), the thing that stops the BBs from flying out of the magazine when you load it, is too stiff and long (that's what she said). So what I did was I took the magazine apart (only 4 philips head screws) and shaved down that BB stopper by about 1-2mm using a very fine needle file (available at Home Depot for like $5 for a complete set). Be careful not to shave it too much or it won't serve its function of keeping the BBs in the mag. Shave it enough so that it feeds the BBs into the gun but also keeps the BBs in the mag (when not in the gun).
I've done this myself to my magazines and they all now feed PERFECTLY.
Despite this massive flaw, at this price, it's hard to NOT justify these magazines if you don't mind putting in 20 minutes doing some minor modifications to all of them. $10 for a KWA K120 or $30 for a Magpul PMAG. The choice is yours. If you don't want to deal with modding it slightly, I would highly recommend testing these in store before you buy them.
-AWESOME price $10/magazine
-Perfect matte look
-Perfect fit (in my KWA, not sure about other brands)
-Easy takedown for maintenance/repair
-Feeds great post-modifications*** (see above)
-Ranger Plate compatible
-Feeding issues in my own 2011 KWA SR-10 (easy fix though)***
-Replaceable sleeves aren't out yet**
Rating: [4 of 5 Stars!]