I bought a G&G GR16 mid cap and it fits and feeds lovely but it's snug. Like, very snug, it takes an amount of force for it to slide in and secure but there's no rattle which I like.
I found the actual one that's supplied with it, it's an M series but seems to only come in high cap, which I don't want.
I did notice that there is a difference in design in the, what I presume, locking tab/slot.
The first picture is the supplied mag with the little raised bit above the slot and the bottom one is the new mid cap with the raised bit at the bottom. Any thoughts why?