I purchased the Bando large. Fits a PX4 with red dot and comp easily and still has room in the other pockets for additional EDC items. I've tried similar bags, and once the pistol is in place you only have room in the other pockets for some envelopes. There are some changes I think would be helpful. All the zipper pulls on the bag are the same. One of the pulls on the pistol pocket would benefit from being different and larger. Like what has been done on the Fade Brief. I've changed the one pull out on my Bando to a longer soft pull and a shorter pull next to it so only the one is easy to grab and open the pocket. Other suggestion would be to a two pull zipper on the large non pistol compartment. That way, whether right hand or left, the zippers could be positioned opposite from which ever side one needs the pistol zippers on, for access. Being right handed, on mine I replaced the zipper pull with a very short one so it won't interfere with a grab for the pistol zipper.
Sincerely, James S.