This Stock Weight Kit makes it quick and easy to add up to 1.6 lbs. of steel weights in the stock of the Ruger American Rifle Stock Generation II rifle. Shifting the center-of-gravity (CG) rearward counteracts heavy muzzle-end weights such as bipods, silencers, etc. and improves the rifle’s balance, reduces felt recoil and improves carrying comfort in the field. The weight and balance of the rifle can be tuned by installing weights in 4 oz. increments based on shooter preferences and needs.