What recoil lessening technology exists in a solid stock? The only real things I can think of is the little springs/pads people add to the end of their stock.
If the bull pup has the same barrel length and is chambering the same round, the recoil should be the same. The force going into your shoulder should be the same.
What could be different is the muzzle jump, or how much the end of the rifle starts to point up after firing. This is a function of torque, where the rifle is pivoting around your shoulder. In a bullpup since your hands are further down the rifle, further from the pivot (your shoulder) you may get more mechanical advantage and be able to control that rise easier.
But that also can be rifle specific, some bull pups still have complaints of being hard to control.
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