Kopfjager Reaper Grip Small Arms Adapter Black. Constructed of hardy silicone the SDR can fit down to 0.85-inch rifle stocks or when doubled it can fit 0.25-inch rifle stocks. At a mere 4.3 ounces the SDR grip is ideal for youth rifles pellet guns and other small air rifles. The SDR grip gives users the confidence and stability associated with the name Kopfjager. Specifications for Kopfjager Reaper Grip Small Arms Adapter: Manufacturer: Kopfjager Color: Black Features of Kopfjager Reaper Grip Small Arms Adapter Ideal for small and youth-sized rifles Constructed of hardy silicone Fits 0.85-inch rifle stocks When doubled fits 0.25-inch rifle stocks Package Contents: Kopfjager Reaper Grip Small Arms Adapter Adapter Kopfjager KJ89006: Reaper Grip Small Arms Adapter Black