Thanks all, but I'm really wondering about the rumor about SCARs eating optics. I read something about the recoil impulse being different somehow. It's a dream to shoot and has minimal felt recoil, they come with the PWS brake. The first scope, the entire knob and it's internals came off. The second, something came loose inside. This sucks as I really liked the scope. I ordered the ACOG, because I know they are very durable and are good about fixing problem scopes (should the SCAR decide to eat another one). I really wanted something better for long range shooting, but with the problems I'm having, I'm hesitant. If the ACOG holds up fine, I'll probably move it to my PTR 91 and get an IOR for the SCAR..