Here's a thing to look for with ANY bobbed-hammer gun: try cocking it. If it's got no "thumb handle" yet can be fully cocked, then it's a "Bubba DAO" - the hammer has been shaved down externally BUT not internally modified to remove the single action notch.
Now some people actually like "Bubba DAO". I can see some merit, but EXTREME care has to be taken on de-cocking. You MUST follow the "throw your thumb pad fully in front of the hammer" routine. If your thumb isn't long enough, or you don't feel comfortable doing it while securing the gun with the same hand, OR it's got a hammer-mounted firing pin, DO NOT go with a "Bubba DAO".
If you can make it work for you though, consider checkering the very top of the hammer to enable slightly more consistent decocking. This makes for a gun that says either "I know what the hell I'm doing" OR "I'm an idiot". Take your pick
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Ruger has produced factory bob-hammers in the GP100, which cannot be SA cocked. They were mostly police and security special issue and were not cataloged that I know of. These are true DAO (vs. "Bubba") same as the cataloged bob-hammer SP101s.
If it's planned as a carry gun and you're willing to take the time to learn the DA trigger, a real DAO gun is fine for a beginner. A "Bubba DAO"
is not a beginner's gun. I can recall one incident at a range where a guy was showing me his "DAO" Taurus snubbie. I asked him if it was really DAO, and he said "yup". Then I made sure it was unloaded...and cocked it. Yup. Hello Bubba. He didn't even know. And he had NO clue how to de-cock from there. I showed him, and explained that filing out the SA notch inside the hammer might be a good idea...
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I wouldn't be concerned about the springs. GP100s are easy to strip and swap springs, the factory manual detailing take-down is available as a free PDF download from Ruger (go to their site, go to either "manuals" or "documentation"...) and spring kits are less than $20 if you run into ignition reliability issues. The GP100 was designed for takedown by newbie owners.