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Yes, according to the Hi Viz sight it will fit the bull barrel MK IV's just not the tapered barrel versions. https://www.hivizsights.com/product/hrblw01/

Brayden, yes Sir. This Sight Fits Ruger Mark I, II, III and IV steel bull barrel pistols; 22/45 with adjustable rear sight (does not fit 22/45 LITE); Single-Six revolvers with adjustable rear sight. Also fits Browning Buck Mark pistols (does not fit Challenge, 5.5 Target, and 5.5 Field).

Yes it will fit IF your MK IV has the Bull barrel "Sight Fits Ruger Mark I, II, III and IV steel bull barrel pistols"