I just bought an m4 style ar. It does not have sights and i want mbus incase the optic wears out while in use. What i want to know is, if i buy an MOE handguard and get a rail section and put it on top and mount the front sight to that, will it be on the same level as the rear? Or will the front sight be too high to get a zero? I can't get a good look at the moe to see if it looks right for a front sight. I know i'm not suposed to put the mbus on the gas block and i want to get the moe instead of a quad rail. Just want to make sure it will work before i buy it. Any other ideas welcome.