AR15..YHM FLIP REAR with STANDARD FRONT ??WORK?? I have a RRA M4 upper with standard front. I had a Magpul flip rear (seemed like it was too tall)and I was 10" high and could not bring it down anymore without the front post coming out. I am looking into getting another YHM flip rear to go with my standard front. Will it work..as far as getting the bullet to come down (line up better with the front). On my other AR (BUSHY) I have a YHM flip front and rear and that works great. The flip rear (YHM) worked good with that standard front sight before I switched to a flip front....Any info?? I am wondering if I put the YHM flip rear on my M4 flattop, will it be ok with a standard front sight? I do not think it is a "f" marked sight.....thanks