I'm thinking of buying an AR with a flat top and the A.R.M.S. #40 flip up rear sight. Since it will take me a while to save up for a red dot sight, will using the A.R.M.S. as my only sight be functional. What sight adjustments would I be able to make with a detachable A2 carry handle that I won't be able to make with the A.R.M.S? It appears that the A.R.M.S. does not have a dial for elevation, but just has fixed short range and long range apertures. How much accuracy will I lose? Thanks