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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Kai's Dragon Mech Battle Pack

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71851 Kai's Dragon Mech Battle Pack

70 pieces in 31 part and color combinations, plus 3 minifigures.

The official piece count includes the 15 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Plates Special 26 pieces

  • Bracket 2 x 2 with 1 x 2 Vertical Studs Black Part 41682 Element 6250020 ×2
  • Plate Special 1 x 2 with 2 End Towballs Black Part 3170 Element 6416838 ×1
  • Plate Special 1 x 2, Top Clip [Open O] Black Part 44861 Element 6347310 ×2
  • Cockpit 4 x 2 x 3 with Pin Hole, and 2 Clips Dark Bluish Gray Part 98876 Element 6384443 ×1
  • Plate Special 1 x 2 with 5.9mm Towball Socket and Towball Dark Bluish Gray Part 14419 Element 6414554 or 6338166 ×4
  • Plate Special 1 x 2 with End Towball Dark Bluish Gray Part 22890 Element 6370802 or 6338168 ×2
  • Plate Special 1 x 2 with Clip Horizontal on Side Dark Red Part 11476 Element 6313126 or 6186001 ×1
  • Plate Special, 2 x 2 Studs and Handle, Closed Ends (Mech Chest Plate / Armor) Dark Red Part 27167 Element 6440776 ×1
  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×4
  • Bracket 1 x 2 - 1 x 2 Inverted Orange Part 99780 Element 6218368 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Orange Part 60897 Element 6352223 or 6055326 ×2
  • Plate Special 1 x 2 [Side Handle Closed Ends] Red Part 48336 Element 4226876 ×2
  • Plate Special 2 x 3 with Rocks Red Part 27261 Element 6554284 ×2

Animal / Creature Body Parts 10 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Black Part 53451 Element 6270103 or 4568385 1 spare in the box ×4
  • Creature Body Part, Barb Large (Claw, Talon) with Clip Pearl Gold Part 16770 Element 6293489 or 6141591 ×4
  • Creature Body Part, Dragon / Thestral Wing with Bar Connection and Marbled Bright Light Orange Pattern Red Part 38547pat0002 Element 6584345 ×2

Bricks Sloped 8 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Orange Part 54200 Element 4504371 or 4248195 1 spare in the box ×1
  • Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder Red Part 15571 Element 6075074 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×2
  • Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] Trans-Orange Part 22388 Element 6581704 or 6250584 1 spare in the box ×3

Plates Round Curved and Dishes 8 pieces

  • Plate Special 1 x 2 Rounded with 2 Open Studs Dark Red Part 35480 Element 6212040 ×8

Minifig Shields, Weapons, & Tools 5 pieces

  • Weapon Hilt Symmetric Dark Bluish Gray Part 66909 Element 6296951 ×1
  • Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Pearl Gold Part 21459 Element 6116596 ×4

Tiles Round and Curved 5 pieces

  • Tile Round 2 x 2 with Gold Dragon Head on Dark Blue Background Print Pearl Gold Part 14769pr0027 Element 6578513 ×1
  • Tile Round 1 x 1 Half Circle Red Part 24246 Element 6258973 1 spare in the box ×4

Bricks Curved 2 pieces

  • Brick Curved 2 x 2 x 2/3 Red Part 15068 Element 6105976 ×2

Tiles 2 pieces

  • Tile 1 x 2 with Groove Trans-Orange Part 3069b Element 6514225 or 6251306 ×2

Bricks Special 1 piece

  • Brick Special 1 x 1 with Studs on 2 Sides Dark Bluish Gray Part 47905 Element 4213574 ×1

Energy Effects 1 piece

  • Flames 5 x 7 x 1 x 1/3 with Studs, Handle Trans-Orange Part 7727 Element 6584976 ×1

Technic Bricks 1 piece

  • Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate Red Part 73109 Element 6385920 ×1

Technic Pins 1 piece

  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×1

Minifigures 3 figures

  • Sora, Mask (Draconus Robes) Minifigure, checked as a whole figure ×1
  • Earth Monster Minifigure, checked as a whole figure ×1
  • Kai (Draconus Form, No Wings or Tails) Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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