Light, but loose - MFT React Quick Detach Grip

I just got this yesterday and was excited to try it out. My first disappointment came when I realized that it had to be slid on from the end of the rail, rather than being installed anywhere, as is possible with a side clamp. In the interest of being fair, however, I decided not to hold that against the MFT React QD Grip, since I should have noticed that from the pictures. Once I did get the grip to slide on, and screwed it securely into place, I noticed that, while it is a comfortable size and weight, there is a small amount of wiggle (either due to the plastic material and/or the bottom vs. side clamping mechanism). That, to me, is unacceptable. Unfortunately, the nature of the packaging (which has to be torn open) makes it difficult to return.