I've discovered that I kinda like the "ball in a box" sight picture presented by Glock factory sights. Normally, I use the "three balls" aftermarket fixed and adjustable (Meprolight) night sights, but I'm interested in trying a really prominant white front dot in conjunction with an adjustable white-outline rear for daytime competition. The Glock plastic adjustable is entirely unsatisfactory, and there aren't a lot of other adjustable white-outline Glock rears to choose from. One it the MMC sight, which is drift-adjustable for windage and screw-adjustable for elevation. These have been around for years and I've read an occasional favorable review of them for pistols other than Glocks. Any Gters out there have any experience with the Glock MMCs they'd care to share? Thanks!