Ok can someone tell me about the CAT front and rear flip up sights and how they have 2 different notches?  The pic on MSTN accessories doesn't show a second notch on the rear but it does on the front.  I know that the 2 notch rear exists because I have handled it before.  When did this come out?  Are the 2 different notches some sort of fixed elevation system, the front has a standard post elevation?  Or are they just for co-witness height adjustment?  You can figure out from the pics how it works.  A torsion spring forces the sight bar down, but another torsion spring (may be one piece spring for both?) pushes the locking bar back.

Ok what about this new spring loaded, detent locked rear flip up that is supposedly Army issue?  It has a BDC cam lever on the left side in addition to windage adjustment.  I haven't been able to find any pictures or anything about it online.

Both of these sights appear to be well made, and if I remember properly, competative in price to the ARMS #40.

Surely someone has some info on these sights?  Both lock up solidly and/or were spring-loaded which would be a major factor in a quality BUIS.

Thanks!

Bump! in search of an answer