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David, this will work for up to a 5.5" Barrel RedHawk. Your GP100's barrel is longer so you will likely need a longer holster. http://shopruger.com/GP100-Triple-K-Belt-Holster-RH-6-Barrel/productinfo/50076/

depends on you barrel length this will fit up to 2 a 5.5 inc barrel but will be slightly loose as the redhawk is a larger frame