Luth-AR 3-Axis Buttplate Plate w/ Insert Black. 2) Side Plate/Stop Nut Nylon Nut 8-32 Thumb Screw (Steel or Aluminum) Thumb Screw Hex Nut 1/4-20 Thumb Screw Star Lock Washer. If you are looking to add the Butt Plate Assembly to your MBA-4 or MBA-2 just purchase kit located on the Accessories tab. SKU: RL-024CB Black SKU: RL-024CF Flat Dark Earth Specifications for Luth-AR 3-Axis Buttplate Plate: Manufacturer: Luth-AR Color: Black Additional Features: w/ Insert Gun Type: Rifle Features of Luth-AR 3-Axis Buttplate Plate: Shipping Weight .5 lbs Shipping Dimensions 6 x 6 x 3 in Color Black Flat Dark Earth Package Contents: Luth-AR 3-Axis Buttplate Plate Luth-AR RL-024CB: 3-Axis Buttplate Plate w/ Insert Black