Welcome to Milsurps.com Robert. Glad to have you with us as a new member. Enjoy!

Three off center? I've seen them worse on original rifles. How does the front sight look in relation to the gas cylinder where it mounts? Is it centered there? Is it left of center also? That is one way you can get the rear sight on the center mark. Be careful however not to start adjusting without pushing some rounds out the end of the barrel. Take it out ad see where it is hitting. You might be surprised