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they should fit unless you have a MK Iv 22/45 which takes a different mag here are the mags for the MK IV 22/45 budsgunshop.com/product_info.php/products_id/39185/ruger+90648+ruger+22%2f45+mark+iv+22+lr++10+rd+black+finish If you ordered the incorrect mag Contact Buds customer service (859) 368-0371 available 9AM to 9PM EST Monday through Friday or use the blue chat now button and they will set up the return . We are not buds employees we are volunteers that answer questions

Paul, these should Fit the Ruger Mark III/Mark IV Rimfire Pistols. ***Note***: This magazine does not fit any Ruger 22/45 models. Since they are Ruger Factory Magazines, I would contact Ruger Customer Service for advice/resolution at Telephone: 336-949-5200 (Monday through Friday 8:00am - 5:00pm ET)

The product page says it will fit your Mark IV.