I'm interested in getting an H&K USPc 9mm. Because of my eyesight getting worse, I know already I want to replace the factory sights. I want to go with an XS Standard Dot front sight, but I don't want to go with the XS rear sight. I'd rather go with a normal rear sight that I can have widened to accommodate the XS front (which means at least .155" from what I've heard). I know Heine's rear sight will work, and I can even order one that has been widened. I'm wondering what other rear sights are available for the USPc.