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Hi Issac, the grip frame is polymer. The 22/45 models have polymer frames, the standard Mark IV is aluminum. Stay safe & have a great day!
Hi Isaac and welcome. It should be polymer. Ruger Mark IV Tactical, 22/45, Single Action, Semi-automatic, ***Polymer Frame Pistol***, Full Size, 22LR, 4.4" Barrel, Threaded Barrel, Cerakote Finish, Elite Jungle, Checkered Grips, Adjustable Rear Sight, 10 Rounds, 2 Magazines 40189. I would verify directly with Ruger Customer Service at Telephone: 336-949-5200 / (Monday through Friday 8:00am - 5:00pm ET). Cheers and stay safe!
You really need to contact Buds because Ruger does not list this model a MkIV will be a aluminum frame a MKIV 22/45 will be polymer here are the ones ruger shows MKIV https://www.budsgunshop.com/product_info.php/products_id/44366/ruger+mark+iv+tactical+.22+lr+10rd+4.4+black+aluminum+grip and the MKIV 22/45 https://www.budsgunshop.com/product_info.php/products_id/34253/ruger+mark+iv+22+45+tactical+.22lr+semi+auto+pistol