The EOTech sight comes with two attachment options: an allen-head screw, which is good, and a thumbscrew, which is even better.
It is, however, pretty much impossible to get anything close to "return to zero" with a screw mount. "I think I torqued it down, oh, about yea much last time..." just doesn't deliver the repeatability needed.
Enter GG&G's Accu-Cam throw-lever mount. Easy enough to install for even a ten-thumbed klutz like me (installation time was <5 minutes thanks to clear and concise instructions,) it gives rock-solid lockup, and what appears to be (at least out to 25 yards) return to zero repeatability. Groovy.
I was almost as bad with the Accu-cam as I was with my self-assembled lower: "Look! You just throw the lever and it pops off! Then you throw the lever and it locks on! Look! It locks up to the rail all solid and stuff and I put it on all by myself! Look!"
Yay, me. :)