The SP101 is a nice IWB revolver. The GP 100 is a belt gun.
Both have many easily installed aftermarket grips.
Both kick ass.
Capacity depends on the model.The GP100 is a medium-frame 6-shot. The SP101 is a small-frame 5-shot.
ATNO82268 said:What is the difference between a Ruger Revolver SP101 and GP100?