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I could not find that listed I suggest you call ruger and ask Telephone: 336-949-5200 or I can measure mine when I get home in the morning if no one gives you a answer until then
William, With this 5" barrel model all you got to worry about is the length. You will need at least a safe that is 11" x 6". The thickness really doesn't matter. Any gun safe that is out there will hold a revolver. The top will close on your GP100 if it fits inside.
cylinder (widest part} is 1.5 inches height is 6 1/4 inches If you would please select my 1st post as the best answer or you can select both as best by opening the question in multiple windows/tabs (before selecting best answer) then selecting a different answer in each window/tab thanks