First off, get a Williams or Lyman receiver rear sight (peep sight.) Then a good fibre optic front and you're set.
In the meantime, a black magic marker over the front will work wonders.
History fails to record a single precedent in which nations subject to moral decay have not passed into political and economic decline. There has been either a spiritual awakening to overcome the moral lapse, or a progressive deterioration leading to ultimate national disaster.
If you think a strong military is expensive, think about what a weak one would cost