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The Ruger GP100, SP101 and Super Redhawk revolvers are arguably the easiest double action revolvers to field strip, certainly much easier than the Smith or Taurus revolvers. To disassemble the GP100 all you really need is a screwdriver to remove the grips, a small nail to capture the mainspring and a punch to remove the trigger guard. You can use the screwdriver to remove the trigger guard, but it requires a fair amount of force and using something sharp increases the chance of marring the gun or injuring yourself. You want to use a fairly stiff nail to capture the mainspring, something like a pin or a paper clip is not strong enough. If you use something like a paper clip the pressure from the mainspring will eventually bend it making it extremely difficult to put back in the gun.
They say a picture is worth a thousand words, a video should be worth even more. With practice you should be able to field strip a GP100/SP101/Super Redhawk in less than two minutes easily.
Assembly is just the reverse of these steps, you will probably need to work the trigger to get the hammer in place and lined up with the holes, otherwise putting it back together is easier than taking it apart.