All of the larger sized Glocks come with the rail, as far as I've seen (20, 21, 29, 30). Mine had one, I couldn't find a light that wouldn't extend past the barrel.
I know the older models didn't like the early gen3's, but as far as I know, they all have them now. My SN started with SCS, so if you get one around that time or newer I can guarantee you'll be fine. If worst comes to worst, contact the seller and ask
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