Luth-AR Buttplate Assembly Black. This complete kit contains everything you need to add the adjustable length-of-pull of the MBA-1 to an MBA-2 or MBA-4. Specifications for Luth-AR Buttplate Assembly: Manufacturer: Luth-AR Additional Features: for MBA-2 Condition: New Package Contents: Luth-AR Buttplate Assembly 1 Butt Plate Frame with insert RL-008F 1 Butt Plate Pad RL-006 1 Extension Tube Spacer/Adapter 1 Butt Plate & Extension Tube Adapter Screws 8-323/8 SCW-01 1 Lockplate RL-010F 1 Steel Thumb Screw TS-01 1 Thumb Screw Star Lock Washer TSW-01 1 Side Plate RL-0011 1 Side Plate RL-025C 2 Side Plate Button Head Cap Screws 8-323/4 SCW-02 2 Side plate/Stop Nut Nyloc Nut 8-32 Black HN-02 Luth-AR BPA-01: Buttplate Assembly Black