I've had three sets of grips for my 15mm rail system and this is by far the best. I was an idiot and didn't tighten the screws that actually hold the bushing's teeth, so I started to wobble at first. I contacted support and as soon as they replied I solved the problem. After tightening the screws everything was tight. I have a 35lb rig that I use them on and they have been perfect. Thanks to their support team. Very quick response, nice and seems very helpful. Very resistant and the leather is so comfortable. They really paid attention to the details of these grips. Highly recommended.