I like and recommend Metalform part# 45-273, which is a flush-fitting, blued steel, 7rd mag, with the flat, dimpled follower, and a nice, locking, removable floor plate. I have 15 of these, and they've all performed all functions flawlessly, after a lot of use, and having been stored constantly loaded for a couple of years.
Edit: I thought I might amend that the base of this mag is actually not quite flush. There is a slight curvature to the bottom/exterior surface, which protrudes just enough to help you with seating a mag. It's just enough to allow me to take full advantage of the weld-on magwell on my main carry gun, and also helps a lot with a stock magwell opening.