Just got an XD9 Service with factory sights. It's shooting high and I'm confident it has a 6 O'Clock aim after looking it up. I prefer point of aim. What are my options? Is the gun 6 O'Clock or are the sights 6 O'Clock? I'm looking at websites for new sights and they don't mention what point of aim they are... If I get adjustable sights, then I could just adjust them, right?. I work at a Machine Shop. Could I modify my factory sights my milling out the rear sight, or would you need to "add material"? Please reply if you have experience in this matter. I'm not interested in opinions or suggestions. Thanks