I'm looking at optics/sight options for my new M4 Carbine with A2 front sight and A3 upper. I know if I put a magnified scope on it, I won't see the front sight at all, but what about with red dots or holo sights. Would the A2 front sight be in the line of sight? I can't decide on a 1-4 or an EO or Aimpoint. I have a 2-7 Leupold on my customized Mini that I love and is a 2 eye aimer at 2x, but want to maybe go with a more close range sight. Also, will any BUIS work with my A2 front sight, or do they only work with another BUIS up front. I'm also wanting to go tritium on the front A2. Thanks for any info you can provide.