Convert your Hyskore DLX Precision Rifle Rest or Dangerous Game™ Machine Rest for use with low-recoil rifles (less than 18 ft./lbs.), like AR-15s and 22-250s. Springs install in three easy steps for time- and hassle-saving convenience. Includes three springs for accommodating a variety of light-recoiling guns: Yellow Spring for 2 lbs./in. of travel; Blue Spring for 4 lbs./in. of travel; and Green Spring for 6 lbs./in. of travel.