Part Number: 12556960V (M2 x 14 roll pin stl pln fin *as) Part Number: 12556963 (Pin,spring) Part Number: 12556971 (Pin) Part Number: 12556973 (Handguard assy) Part Number: 12556979 (Screw) Part Number: 12556980 (Stop) Part Number: 12556984 (Pawl) Part Number: 12556996 (Pin) Part Number: 12556B (Ne) Part Number: 12556BHH (Bolt) Part Number: 12556CH5-Z (Bolt) Part Number: 12556CH5ZY (Screw, hex cap, 1-1/4-7x3-1/2 gr) Part Number: 12556SHC (Screw) Part Number: 12-557 (Cap)