Purchased my 512 on a Saturday afternoon. It took all of 5 minutes to sight in. Got off work on Monday and went straight to my hunting property. I set up and after an hour this hog came out and I dropped him. Didn't think it could be so easy.
I was able to get the 512 through the North American Hunting Club product testing program. This sight is a great product. It mounted easily on my AR and it's great how quick you can get on target.