My CYMA M4 came with flip up "iron" (plastic) sights.  The rear sight is a small aperture peep sight:   Don't get me wrong, it's a perfectly functional peep sight with both windage and elevation adjustment.  It's just that my understanding is that peep sights are intended for high accuracy use at ranges over 200 yards, which on a ~300fps airsoft carbine (and in CQB at that) seems a little... theatrical.   Any reason I shouldn't just drill out most of the rear sight to ma