An adjustable recoil reduction system for a firearm, the system comprising: an axially extending buttstock having a longitudinal stock axis, a rear end (35, 127), a front end, and a longitudinally extending internal cavity; a ram including a cantilevered mounting extension, the mounting extension projecting forward from the ram through the rear end of the buttstock into the internal cavity, the mounting extension slideably coupling the ram to the buttstock; a butt pad coupled to the ram; an adjustable plunger assembly comprising a rear spring guide disposed in the buttstock and a preload adjustment screw rotatably coupled to the ram and engaging the rear spring guide, the plunger assembly being movable forward and rearward in the buttstock; and a first compression spring mounted inside the buttstock and engaged by the rear spring guide, the plunger assembly operating to compress the first compression spring when the buttstock moves rearward relative to the plunger assembly; a second compression spring concentrically arranged around the first compression spring; wherein rotating the adjustment screw in a first direction advances the rear spring guide and compresses the first compression spring for setting a first preload condition, and rotating the adjustment screw in an opposite second direction retracts the rear spring guide and allows the first compression spring to expand for setting a second preload condition; wherein when a rearward acting recoil force is generated by discharging the firearm, the buttstock moves rearward and compresses the first compression spring against the plunger assembly to absorb at least a portion of the recoil force. an axially extending buttstock having a longitudinal stock axis, a rear end (35, 127), a front end, and a longitudinally extending internal cavity; a ram including a cantilevered mounting extension, the mounting extension projecting forward from the ram through the rear end of the buttstock into the internal cavity, the mounting extension slideably coupling the ram to the buttstock; a butt pad coupled to the ram; an adjustable plunger assembly comprising a rear spring guide disposed in the buttstock and a preload adjustment screw rotatably coupled to the ram and engaging the rear spring guide, the plunger assembly being movable forward and rearward in the buttstock; and a first compression spring mounted inside the buttstock and engaged by the rear spring guide, the plunger assembly operating to compress the first compression spring when the buttstock moves rearward relative to the plunger assembly; a second compression spring concentrically arranged around the first compression spring; wherein rotating the adjustment screw in a first direction advances the rear spring guide and compresses the first compression spring for setting a first preload condition, and rotating the adjustment screw in an opposite second direction retracts the rear spring guide and allows the first compression spring to expand for setting a second preload condition; wherein when a rearward acting recoil force is generated by discharging the firearm, the buttstock moves rearward and compresses the first compression spring against the plunger assembly to absorb at least a portion of the recoil force.