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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.

Arin's Battle Mech

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71804 Arin's Battle Mech

95 pieces in 60 part and color combinations, plus 2 minifigures.

The official piece count includes the 9 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

Black 28 pieces

  • Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section Black Part 40379 Element 6055070 or 4508453 ×1
  • Bar 1 x 4 x 2 with Studs Black Part 4083 Element 408326 ×1
  • Brick Curved 2 x 2 with Lip, No Studs Black Part 30602 Element 6476459 or 4143875 ×2
  • Brick Curved, 3 x 1 with 1/3 Inverted Cutout Black Part 70681 Element 6328095 ×2
  • Brick Sloped Inverted 45° 6 x 1 Double with 1 x 4 Recessed Black Part 52501 Element 6064228 or 4260862 ×1
  • Brick Special 1 x 1 with Studs on 2 Sides Black Part 47905 Element 4214559 ×1
  • Creature Body Part, Barb Large (Claw, Talon) with Clip Black Part 16770 Element 6254273 or 6177168 ×2
  • Plate Round Corners 2 x 6 Double Black Part 18980 Element 6105963 ×1
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Black Part 60470b Element 6310268 or 4556158 ×5
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Black Part 60478 Element 4515368 ×2
  • Plate Special 2 x 2 with Only 2 studs Black Part 33909 Element 6192346 ×1
  • Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint Sockets Black Part 48172 Element 6296186 or 4275826 ×1
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×1
  • Tile Special 1 x 2 with Two Vertical Teeth / Tooth Black Part 15209 Element 6127506 ×3
  • Wedge Plate 2 x 4 Black Part 51739 Element 4531412 ×1
  • Wedge Plate 4 Stud 45° Angle Plate Black Part 15706 Element 6054852 ×2
  • Wedge Plate 4 x 6 Cut Corners Black Part 32059 Element 4129572 ×1

Pearl Gold 10 pieces

  • Bar 3L Pearl Gold Part 87994 Element 6093529 or 6078895 1 spare in the box ×1
  • Brick Wedged, Curved 2 x 3 x 2/3 Two Studs, Wing End Pearl Gold Part 47456 Element 6357918 or 4286599 ×2
  • Large Figure Weapon 6 Blade Ninja Star / Shuriken Pearl Gold Part 41125 Element 6421595 or 6259116 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Pearl Gold Part 15573 Element 6092594 ×1
  • Shield Round Bowed with Gold Dragon, Red Eyes, Fans Print Pearl Gold Part 75902pr0022 Element 6464346 ×1
  • Tile Round 2 x 2 with Dragon Head, White Gear in Dark Azure Circle Print Pearl Gold Part 14769pr9988 Element 6467216 ×1
  • Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Pearl Gold Part 21459 Element 6116596 1 spare in the box ×2
  • Weapon Sword, Big Blade with Bar Pearl Gold Part 98137 Element 6270131 or 4646843 ×1

Bright Light Orange 9 pieces

  • Mech Leg, Left, with Black Pin Bright Light Orange Part 70946c01 Element 6491182 ×1
  • Mech Leg, Right, with Black Pin Bright Light Orange Part 70943c01 Element 6491198 ×1
  • Plate 2 x 3 Bright Light Orange Part 3021 Element 6097503 or 4645048 ×1
  • Plate 2 x 6 Bright Light Orange Part 3795 Element 6097509 ×3
  • Plate Special, 2 x 2 Studs and Handle, Closed Ends (Mech Chest Plate / Armor) Bright Light Orange Part 27167 Element 6378726 or 6166889 ×1
  • Tile 2 x 2 with Groove Bright Light Orange Part 3068b Element 6020147 or 4525871 ×2

Magenta 9 pieces

  • Brick 1 x 2 Magenta Part 3004 Element 4519195 or 4206360 ×2
  • Brick Round 1 x 1 Open Stud Magenta Part 3062b Element 6172869 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Magenta Part 3040b Element 4625626 ×4
  • Plant, Leaves 4 x 3 Magenta Part 2423 Element 6268822 or 6177019 ×1
  • Plate Special 1 x 2 with Clip Horizontal on Side Magenta Part 11476 Element 6313117 or 6135604 ×1

Dark Blue 8 pieces

  • Brick Curved 4 x 1 Double, No Studs Dark Blue Part 93273 Element 6037886 ×6
  • Plate 1 x 6 Dark Blue Part 3666 Element 4508313 or 4177734 ×1
  • Rock Panel 2 x 4 x 6 Dark Blue Part 47847 Element 6507898 or 6430006 ×1

Dark Bluish Gray 7 pieces

  • Plate Special 1 x 2 [Side Handle Closed Ends] Dark Bluish Gray Part 48336 Element 6146321 ×3
  • Plate Special 1 x 2 with End Towball Dark Bluish Gray Part 22890 Element 6370802 or 6338168 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Dark Bluish Gray Part 3700 Element 4211111 ×1
  • Wheel Arch, Mudguard 3 x 4 with 2 x 2 Plate Dark Bluish Gray Part 28326 Element 6178912 ×1

Light Bluish Gray 7 pieces

  • Cockpit 4 x 2 x 3 with Pin Hole, and 2 Clips Light Bluish Gray Part 98876 Element 6453106 ×1
  • Launcher, Brick Special 1 x 4 with Inside Clips (Disk Shooter) Light Bluish Gray Part 63783 Element 6351294 ×1
  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×2
  • Plate Special 1 x 2, Top Clip [Open O] Light Bluish Gray Part 44861 Element 6326078 ×2
  • Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate Light Bluish Gray Part 73109 Element 6326478 ×1

Dark Purple 4 pieces

  • Plate 2 x 2 Dark Purple Part 3022 Element 6047422 or 4224861 ×1
  • Tile Round 2 x 2 with Bottom Stud Holder Dark Purple Part 14769 Element 6097501 ×3

Dark Green 3 pieces

  • Plate Angled 2 x 2 with Step and Hole in Center Dark Green Part 79846 Element 6467608 ×2
  • Tile Special 2 x 3 Pentagonal Dark Green Part 22385 Element 6285134 ×1

Flat Silver 3 pieces

  • Weapon Pike / Spear Flat End Flat Silver Part 93789 Element 4611883 ×2
  • Weapon Sword / Khopesh Flat Silver Part 93247 Element 6461579 ×1

Opal Trans-Purple 2 pieces

  • Brick Wedged, Sloped 4 x 4 Fractured Polygon Top Opal Trans-Purple Part 64867 Element 6507893 or 6442194 ×1
  • Rock 1 x 1 Crystal 5 Point Opal Trans-Purple Part 30385 Element 6507866 or 6442192 ×1

Sand Blue 2 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Sand Blue Part 11477 Element 6179812 ×2

Dark Tan 1 piece

  • Wedge Plate 4 x 8 Cut Corners Dark Tan Part 68297 Element 6439782 ×1

Trans-Red 1 piece

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Red Part 54200 Element 6245252 or 4244363 1 spare in the box ×1

Yellow 1 piece

  • Technic Pin without Friction Ridges Lengthwise Yellow Part 3673 Element 6331822 1 spare in the box ×1

Minifigures 2 figures

  • Wolf Mask Warrior, Shoulder Pads Minifigure, checked as a whole figure ×1
  • Arin, Ninja Headwrap 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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