I have two 9mm SBR used for home defense and competition. I have been running a Holosun 407C on the competition gun (Steel Challenge and USPSA), but recently tried and older Trijicon MRO. I like the larger field-of-view, but find even with the RDS at the end of the receiver rail I'm having difficulty acquiring targets transitioning left-to-right. This might be somewhat related to my lack of binocular vision (can't fuse left and right eyes). Is it worth moving the RDS further outboard or is this something to train through? Didn't notice this with the smaller Holosun. As an old guy this doesn't matter much save for the fact that my HD configuration includes a Holosun 510 which is, itself, fairly large.