Does anyone have a good explainer on the at least three different and incompatible styles of Glock rails (FMDA, P80, and something else), and perhaps even information on where to find dimensional drawings and how-to-make-at-home tutorials? I've read that rails are something you CAN make at home even though most people don't want to, but I can't find anything online beyond some years-old half-completed projects.
Same for the "locking blocks", are there dimensional drawings anywhere?