A method for upgrading a non-recoil suppressing (NRS) stock to a special operations (Spec Ops) stock with full recoil suppression. The new parts are the slide member and lever that has a cam member mounted on its upper end and an extension spring attached to its bottom end. A locking pin is removed from the stationary slide member and two retainer pins are inserted from the sides into the new slide member to facilitate spring action. This structure functions in the same manner as the recoil reduction structure illustrated in U.S. Pat. No. 5,722,195. A replacement sleeve has a rib member extending downwardly from its bottom surface. Replacement sleeve and extension spring are assembled in a tubular member to form a second recoil reduction assembly. This recoil reduction structure functions in the same manner as the structure illustrated in U.S. Pat. No. 6,732,466.