I bet the mounting isn't tight on that. A lot of RIS mounted attachments that use that quick release have issues with wobbling. In the end, you get what you pay for. Look for some reviews of people that used it and see what they think. I wouldn't buy a sightmark product and I use EOTech on my guns. Its worth the money to get the quality they provide. For the zoom you want, I would go with a true scope though. You could get a 3 to 9x zoom and would do the same thing you are looking for.