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Hi Christopher, Yes here is 4.2 https://www.budsgunshop.com/catalog/product_info.php/products_id/48995/Ruger+GP100+.357+Mag+4.2+7+Shot+Fiber+Optic+Front+Sight

They are all 4.2 inches verified at Rugers website. They are just frequently listed as 4 inches by most vendors. https://ruger.com/products/gp100/models.html

Here's all the models -- https://www.budsgunshop.com/catalog/advanced_search_result.php?keywords=ruger+gp100

Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

https://www.budsgunshop.com/catalog/advanced_search_result.php?keywords=ruger+gp100&manufacturers_id=369&typeid=1&manufacturers_id=369