5x M3x20 Grip Head Allen Drive Bolts 2x M3x12 Grip Head Allen Drive Bolts (for Bid D Builds) 5-7x M3 Nuts 1x M3x8-12 Bolt 1x M10x20 Bolt 22 Barrel Liner JB Weld Tension Spring (10-12mm OD with 30-35mm of windings) or Rubber Band 3/8″ or 10mm x 125″ or 40mm and 3-4 corrosponding thick “10mm” nuts small compression spring for trigger