I bought a 3-pack of Magpul Speedplates for my Gen 3 G19. I figured they would be great on my NFML preban mags as these mags do not drop free. None of the three mags were able to lock in securely to the gun with the Speedplates installed. I suspect it is because the lips of the Speedplates come up too high. The preban mags take some effort to lock in securely as is, unlike the 10rders that go in and out effortlessly. Its too bad the Speedplates didn't work out because they would have made taking the mags out much easier!