I actually switched my order today from a SDN6 to a SF SOCOM. I got to see and attach both to a weapon side by side and the SF mount is rock solid compared to the AAC which wiggles some. I figured I'm going to have it for a long long time and I didn't want to regret not getting the SF. The can cost more, but it is rated up to 300WM and has some other nice features. The mounts are pretty close in price as well.