I'm looking for an A1 rear sight aperture for my FAL. I am not into ARs so this style sight is kinda new to me. I have an A2 aperture on it know but would like to have two small apertures on different sight planes instead of one large and one small. I can't seem to find one though. I have seen some threads stating that some A1 apertures have no change in sight plane, and the ones I can find for sale have no info on them. Anyone know where I might find one?