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Manufacturer Answer
As of right now, the rear dovetail filler is specially made for standard size Glocks where it will be a flush fit with the profile of the slide. Whereas if you put this on a slimline you would have overhang off the sides. We are working on either; including the slimline rear dovetail filler in the near future in this SKU or just making a 2nd SKU that has the FT Front + Slimline specific dovetail filler.