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Jessica, this is a proprietary frame from Ruger, it doesn't have a designation. You just have to make sure your grips are compatible with the GP100.
Some here >>> https://engineeredaccessories.com/product-category/handgun-grips/handgun-grips-ruger/handgun-grips-ruger-gp-100-grips-inserts/
Stay safe & have a great day!

Hi Jessica and welcome. There are several grip options depending on your taste and budget. Some options are : VZ - https://vzgrips.com/shop-all/revolvers-grips/ruger-gp100-grips/ -------------------------------------------- Ruger- https://shopruger.com/Rubber-Grip-w_-Rosewood-inserts/productinfo/70083/ ---------------------------------------- And one of my favorites, ETSY - etsy.com/market/ruger_gp100_grips - Cheers and stay safe!

Jessica, The GP100 frame is most similar to a S&W L frame but the frame is proprietary so S&W L frame grips won't fit. You need ones specifically made for the Ruger gp100. Id recommend checking this website (altamontco.com) or just Google Ruger gp100 grips and it's the second page right under Amazon. They make great grips and have several options for the gp100. Hope this helps.