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Lymans website doesn't have the Maverick listed as compatible. You could contact them and ask https://www.lymanproducts.com/customer-service/ Or LYMAN PRODUCTS SALES & SUPPORT Address: Lyman Products Corp 475 Smith Street Middletown, CT 06457 Hours: Monday through Friday, 9:00 am to 4:00 pm, EST Consumer & Dealer Sales and Service: 800-225-9626 800-423-9704 860-632-2020 Fax: 860-632-1699 To email Lyman Customer Service, please click here.

Patrick, this will fit the Maverick 88 as well as the 500/590 Receiver. Cheers and stay safe! Option : https://www.ebay.com/itm/TacStar-12-Gauge-Sidesaddle-Mossberg-500-590-and-Maverick-88-Tactical-Rail-Mount-/112614707588