pin 148 therein a cam roller 149 is pivotally secured to one end of lever 147 a retainer member 150 is secured to the other end of 147 and it captures one end of spring 152 the other end of spring 152 is captured by a pin 153 the top portion of spring 152 extends into a deeper recess 155 a cover member 160 has a front end 161 a rear end 162 a left side wall 163 and a fight side wall 164 finger grips 167 are formed in both of the side walls 163 and 164 cover member 160 has a bottom wall 170 having a bore hole 172 therein tracks 174 are formed on the inner side wall surfaces and they telescopically receive rails 142 a screw 176 extends upwardly through bore hole 172 and is threaded into the bottom end era tapered nut 178 once cover 160 is slid onto rails 142 screw 176 is tightened which causes tapered nut 178 to push upwardly until it contacts cam roller 149 and preloads spring 152 the length of cover member 160 is about 1 inch short of the length of primary recess 132 when the rifle is fired long gun stock 128 will travel rearwardly while cover member 160 is held stationary by the forward hand of the person holding the rifle cam roller 149 will contact tapered nut 178 causing lever 147 to pivot forwardly causing spring 152 to be stretched thereby reducing the recoil force in fig2 and 26 cover member 160 is illustrated as having a handgrip member 190 with its top end pivotally secured to hinge assembly.