If it is a dbm model, the mag surround acts as your bottom piece like the trigger guard does on the rear pillar. If it is a blind mag, there is a bushing washer (don't know what to call it) that the front screw passes through... if you pop that out of the stock, and then enlarge the existing hole (for the screw) but do not make the hole any larger than that bushing thing, it can serve as your bottom guide like the trigger guard when your reinstall it.
In other words, enlarge the hole with a slightly bigger drill bit, set the pillar on top of the bushing. Trim the pillar so it is proper height.
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