Just got the Saint Edge in a CA configuration. However, be aware that the Kingpin and other similar quick pin options will not work with the Saint Edge. The detent pin on for the rear takedown pin on the Edge comes in from the pistol grip (like the safety detent) and not from the rear of the receiver like most lowers. Kingpin and other similar devices have a cutout in the takedown pin and this orientation is fixed by the detent pin, so on the Edge the Kingpin is oriented 90 degrees out the position where it will allow a push-button separation of the upper and lower receiver. Making the Kingpin and other similar options useless on the Saint Edge.
Also the AR Maglock gen 2 will not release the mag unless the BCG is forward. With LRBHO the the upper and lower do not separate enough for the Maglock to fit between the receivers. Per Maglock this will improve after 500-1000 rounds. Right now after the last round I have to hit the bolt release. Push the rear takedown pin in until I can pivot the upper. Change out my magazine and then close the upper and push in the rear takedown pin. Then rack a round into the chamber. Obviously, not a quick mag change!