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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 Spinjitzu Battle Mech

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71839 Arin's Spinjitzu Battle Mech

201 pieces in 75 part and color combinations, plus 2 minifigures.

The official piece count includes the 12 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 70 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 ×10
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] Black Part 85080 Element 6078253 or 4567436 ×2
  • Brick Sloped 65° 2 x 1 x 2 Black Part 60481 Element 4515373 ×2
  • Brick Special 1 x 1 with Stud on 1 Side Black Part 87087 Element 4558954 ×4
  • Brick Special 1 x 2 with Studs on 2 Sides Black Part 52107 Element 4253815 ×2
  • Brick Wedged, Curved 2 x 3 x 2/3 Two Studs, Wing End Black Part 47456 Element 4285883 or 4218569 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×4
  • Plate 2 x 3 Black Part 3021 Element 302126 ×3
  • Plate Angled 2 x 2 with Step and Hole in Center Black Part 79846 Element 6469080 ×1
  • Plate Round Corner 3 x 3 with 2 x 2 Round Cutout Black Part 68568 Element 6325190 ×4
  • Plate Special 1 x 2 Rounded with 2 Open Studs Black Part 35480 Element 6210270 ×5
  • Plate Special 1 x 2 with Angled Handles on Side Black Part 92692 Element 4604304 ×2
  • Plate Special 1 x 2 with Clip Vertical on End Black Part 78256 Element 6350725 ×2
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Black Part 3839b Element 383926 ×2
  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Half Hollow Anti-stud] - Updated Version Black Part 4304 Element 6469445 ×4
  • Plate Special 2 x 3 with Rocks Black Part 27261 Element 6195185 ×5
  • Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Black Part 18674 Element 6195325 ×1
  • Technic Brick Special 2 x 2 with Ball and Axle Hole, with 6 Holes in Ball Black Part 57909b Element 6521191 ×4
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×2
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Black Part 99563 Element 6156991 ×2
  • Weapon Hilt Symmetric Black Part 66909 Element 6331084 ×1
  • Wedge Plate 2 x 2 Cut Corner Black Part 26601 Element 6174243 ×4
  • Wedge Plate 4 x 6 Cut Corners Black Part 32059 Element 4129572 ×1
  • Wedge Plate 6 x 3 Left Black Part 54384 Element 4283047 ×1
  • Wedge Plate 6 x 3 Right Black Part 54383 Element 4283046 ×1

Pearl Gold 39 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Pearl Gold Part 53451 Element 6270109 or 4618195 1 spare in the box ×2
  • Arm Mechanical with Clip [Thick Support] Pearl Gold Part 98313 Element 6262192 or 6006741 ×6
  • Bracket 1 x 2 - 1 x 2 Pearl Gold Part 99781 Element 6493687 ×8
  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Pearl Gold Part 47457 Element 4286597 ×2
  • Cone 1 x 1 [Top Groove] Pearl Gold Part 59900 Element 4529247 ×1
  • Large Figure Cover 4 x 5 x 2 with Bar, 4 Studs, Ridged Pearl Gold Part 4986 Element 6466418 ×2
  • Large Figure Weapon Hook Pearl Gold Part 5310 Element 6593330 or 6481366 ×1
  • Large Figure Weapon Sword, 3 Bar Holes and Axle Hilt Pearl Gold Part 35633 Element 6330240 or 6270026 ×1
  • Plate Round 1 x 1 with Solid Stud Pearl Gold Part 6141 Element 4523159 1 spare in the box ×6
  • Plate Special 1 x 1 with Vertical Tooth Pearl Gold Part 15070 Element 6083975 ×2
  • Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Pearl Gold Part 48267 Element 6385549 ×1
  • Tile Round 2 x 2 with Dragon Head, White Gear in Dark Azure Circle Print Pearl Gold Part 14769pr9988 Element 6467216 ×1
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Pearl Gold Part 99563 Element 6207933 or 4651407 ×2
  • Tile Special 2 x 3 Pentagonal Pearl Gold Part 22385 Element 6343767 ×4

Bright Light Orange 26 pieces

  • Brick 2 x 2 Bright Light Orange Part 3003 Element 6295078 or 4645051 ×2
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Bright Light Orange Part 11477 Element 6099728 ×8
  • Brick Curved 2 x 2 x 2/3 Bright Light Orange Part 15068 Element 6099730 ×1
  • Brick Special 2 x 5 with Slope, Studs on Side Bright Light Orange Part 79897 Element 6440445 ×2
  • Large Figure Cover 4 x 3 x 2 with Bar, 4 Studs, Ridged Bright Light Orange Part 79896 Element 6538415 ×1
  • Plate 2 x 4 Bright Light Orange Part 3020 Element 6097511 ×1
  • Plate Angled 2 x 2 with Step and Hole in Center Bright Light Orange Part 79846 Element 6466696 ×5
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Bright Light Orange Part 99563 Element 6236454 ×2
  • Wedge Plate 3 x 2 Left Bright Light Orange Part 43723 Element 6020145 ×2
  • Wedge Plate 3 x 2 Right Bright Light Orange Part 43722 Element 6020146 ×2

Dark Bluish Gray 26 pieces

  • Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip] Dark Bluish Gray Part 3484 Element 6439040 ×2
  • Bracket 1 x 1 - 1 x 1 Inverted Dark Bluish Gray Part 36840 Element 6225494 ×4
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Dark Bluish Gray Part 54200 Element 4504378 or 4244373 1 spare in the box ×2
  • Brick Sloped Inverted 45° 4 x 1 Double with 1 x 2 Recessed Dark Bluish Gray Part 32802 Element 6185675 ×1
  • Brick Special 1 x 2 x 1 1/3 with Rotation Joint Socket Dark Bluish Gray Part 80431 Element 6398662 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Dark Bluish Gray Part 4032a Element 4211042 ×4
  • Plate Special 1 x 2 with 5.9mm Centre Side Towball Dark Bluish Gray Part 14417 Element 6414560 or 6338160 ×2
  • Plate Special 1 x 2 with Clip Horizontal on End Dark Bluish Gray Part 63868 Element 6336990 or 4581225 ×2
  • Plate Special 4 x 4 with 2 x 2 Opening Dark Bluish Gray Part 64799 Element 6186825 ×1
  • Technic Brick Special 2 x 2 with 10.2mm Balls with Holes and Axle Hole Dark Bluish Gray Part 17114 Element 6065816 ×1
  • Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole, No Arm Holes Dark Bluish Gray Part 67696 Element 6338291 ×6

Trans-Dark Pink 17 pieces

  • Dish 2 x 2 Inverted [Radar] Trans-Dark Pink Part 4740 Element 6580376 or 6245302 ×1
  • Flame / Headwear Accessory Plume / Feather, Triple Point Trans-Dark Pink Part 64647 Element 6303223 1 spare in the box ×2
  • Plate 1 x 2 Trans-Dark Pink Part 3023 Element 6514008 or 6240228 ×10
  • Plate Round 1 x 1 with Solid Stud Trans-Dark Pink Part 6141 Element 6514060 or 6240230 1 spare in the box ×4

Light Bluish Gray 7 pieces

  • Bracket 1 x 2 - 2 x 2 Light Bluish Gray Part 44728 Element 6117967 or 6009014 ×1
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×2
  • Plate Special 1 x 2 5.9mm Towball Socket Light Bluish Gray Part 14418 Element 6414556 or 6338163 ×2
  • Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate Light Bluish Gray Part 73109 Element 6326478 ×2

Red 6 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×6

Reddish Brown 6 pieces

  • Technic Axle Connector Smooth [with x Hole + Orientation] Reddish Brown Part 59443 Element 4531751 ×4
  • Technic Axle and Pin Connector Angled #2 - 180° Reddish Brown Part 32034 Element 6333110 or 6184719 ×2

Light Aqua 1 piece

  • Plant / Animal Body Part, Tree / Branch / Tail / Appendage / Tentacle with Pin Light Aqua Part 69858 Element 6544733 1 spare in the box ×1

Opal Trans-Clear 1 piece

  • Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Opal Trans-Clear Part 21459 Element 6521182 1 spare in the box ×1

Sand Blue 1 piece

  • Creature, Dragon, Baby, Dark Blue Markings, Lime Eyes Print Sand Blue Part 3215pr0001 Element 6546658 or 6434535 ×1

White 1 piece

  • Brick Special 1 x 2 with Rotation Joint Pin White Part 4920 Element 6472887 ×1

Minifigures 2 figures

  • Spectral Dragonian Warrior, Ghost Lower Body Minifigure, checked as a whole figure ×1
  • Arin, Black Hair and Mask 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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