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Hi Bryan, it will fit the Glock 40 MOS with this adapter plate >>> https://chpws.com/product/v4-mil-leo-mos-leupold-delta-point-pro/ Stay safe & have a great day!

Hi Bryan and welcome. Yes with Glock MOS Plate #1. Just match your Gen to Plate #1 (I ordered the complete set so I could change to other red dots in the future): https://store.glock.us/catalogsearch/result/?q=adapter+plate