The overall quality of these mags are meh, like what I'd expect from a lower end company like Dboy. The build quality isn't great as it uses a passible quality plastic that isn't very thick. I wouldn't recommend clipping them together at all, they're way too brittle (as are most G36 magazines). They don't fit or feed in any Ares or S&T/Umarex G36s (as I had to learn the hard way), but my local field uses them in their rental guns that are TM clones (JG, CYMA, Dboy) and they work and feed just fine.