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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 Fighter

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70721 Kai Fighter

186 pieces in 80 part and color combinations, plus 2 minifigures.

The official piece count includes the 10 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 44 pieces

  • Plate 1 x 1 Black Part 3024 Element 302426 1 spare in the box ×2
  • Plate 2 x 16 Black Part 4282 Element 428276 or 428226 ×1
  • Plate 2 x 4 Black Part 3020 Element 302026 ×4
  • Plate 4 x 6 Black Part 3032 Element 303226 ×1
  • Plate 1 x 2 Green Part 3023 Element 302328 ×9
  • Plate 1 x 2 Red Part 3023 Element 302321 ×4
  • Plate 1 x 3 Red Part 3623 Element 362321 ×4
  • Plate 1 x 6 Red Part 3666 Element 366621 ×4
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×2
  • Plate 2 x 2 Corner Red Part 2420 Element 242071 or 242021 ×2
  • Plate 2 x 3 Red Part 3021 Element 302121 ×7
  • Plate 1 x 3 Tan Part 3623 Element 4121921 or 362305 ×2
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×2

Plates Special 19 pieces

  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Black Part 3794b Element 379426 ×2
  • Plate Special 1 x 2, Top Clip [Split] Black Part 92280 Element 4598528 ×2
  • Plate Special 1 x 2 with Pin Hole on Top Dark Bluish Gray Part 11458 Element 6019987 ×2
  • Plate Special 1 x 2 with Door Rail Light Bluish Gray Part 32028 Element 4211568 ×4
  • Plate Special 3 x 2 with Rounded End, Hole Light Bluish Gray Part 3176 Element 4211419 ×2
  • Bracket 1 x 2 - 2 x 2 Inverted Red Part 99207 Element 6001806 ×1
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Red Part 60470b Element 6360036 or 4556153 ×6

Bricks Sloped 17 pieces

  • Brick Sloped 45° 2 x 1 with 2/3 Cutout [Original Version] Black Part 92946 ×4
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×1
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×6
  • Brick Sloped Inverted 45° 4 x 4 Double with 4 x 2 Recessed, 2 Holes Black Part 72454 Element 4658977 ×1
  • Brick Sloped 30° 1 x 2 x 2/3 Dark Bluish Gray Part 85984 Element 4567887 ×1
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Red Part 3747b Element 4500462 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×2

Plates Wedged 14 pieces

  • Wedge Plate 12 x 3 Left Black Part 47397 Element 4209003 ×1
  • Wedge Plate 12 x 3 Right Black Part 47398 Element 4209013 ×1
  • Wedge Plate 3 x 3 Cut Corner Black Part 2450 Element 4227684 or 245026 ×4
  • Wedge Plate 6 x 3 Left Black Part 54384 Element 4283047 ×1
  • Wedge Plate 6 x 3 Right Black Part 54383 Element 4283046 ×1
  • Wedge Plate 4 x 2 Left Red Part 41770 Element 4161329 ×1
  • Wedge Plate 4 x 2 Right Red Part 41769 Element 4160866 ×1
  • Wedge Plate 8 x 3, 22° Left Red Part 50305 Element 6059021 or 4610488 ×2
  • Wedge Plate 8 x 3, 22° Right Red Part 50304 Element 6059013 or 4610492 ×2

Bricks Special 11 pieces

  • Brick Special 1 x 4 with Groove Black Part 2653 Element 265326 ×2
  • Brick Special 1 x 1 with Handle Light Bluish Gray Part 2921 Element 6170569 or 4225532 ×2
  • Brick Special 1 x 2 with 2 Studs on 1 Side Red Part 11211 Element 6019155 ×5
  • Brick Special 1 x 4 with 4 Studs on One Side Red Part 30414 Element 4177991 or 4157223 ×2

Tiles 11 pieces

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×2
  • Tile 1 x 6 with Groove Dark Bluish Gray Part 6636 Element 4210651 ×2
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×1
  • Tile 2 x 4 with Groove Red Part 87079 Element 4560179 ×6

Hinges, Arms and Turntables 10 pieces

  • Hinge Brick 2 x 2 Top Plate Thin Black Part 6134 Element 4124096 or 613426 ×2
  • Turntable 2 x 2 Plate, Base Black Part 3680 Element 368076 or 368026 ×2
  • Turntable 4 x 4 Square Base, Locking Black Part 61485 Element 4517986 ×2
  • Turntable 2 x 2 Plate - Top Light Bluish Gray Part 3679 Element 4540203 or 4495467 ×2
  • Hinge Brick 1 x 2 Base Red Part 3937 Element 393721 ×2

Bricks Curved 8 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 ×2
  • Brick Curved 10 x 1 [Symmetric Inside Ridges] Red Part 13731 Element 6208565 or 6037665 ×2
  • Brick Curved 3 x 1 No Studs Red Part 50950 Element 4251162 ×2
  • Brick Curved 6 x 1 Red Part 42022 Element 4160390 ×2

Plates Round Curved and Dishes 8 pieces

  • Plate Round 1 x 1 with Solid Stud Pearl Gold Part 6141 Element 4523159 1 spare in the box ×6
  • Plate Round 4 x 4 with Pin Hole Red Part 60474 Element 4515348 ×2

Minifig Shields, Weapons, & Tools 7 pieces

  • Weapon Sword / Katana / Shamshir with Uncapped Pommel [Square Guard] Flat Silver Part 30173b Element 4569471 1 spare in the box ×2
  • Weapon Sword, Big Blade with Bar Pearl Gold Part 98137 Element 6270131 or 4646843 ×4
  • Weapon Axe Blade, Complex (Ninjago) [Techno-Blade] Trans-Red Part 15621 Element 6054841 ×1

Bricks 5 pieces

  • Brick 1 x 2 x 2 with Inside Stud Holder Red Part 3245c Element 4143832 ×2
  • Brick 1 x 4 Red Part 3010 Element 301021 ×1
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×2

Tiles Special 5 pieces

  • Tile Special 2 x 2 Inverted Dark Bluish Gray Part 11203 Element 6013082 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Pearl Gold Part 2412b Element 4490599 ×3

Bricks Round and Cones 4 pieces

  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Black Part 30367b Element 4158779 ×1
  • Cone 1 x 1 [Top Groove] Pearl Gold Part 59900 Element 4529247 ×2
  • Cone 1 x 1 [Top Groove] Trans-Red Part 59900 Element 6514021 or 6337596 ×1

Technic Bricks 4 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Tan Part 3700 Element 4205107 or 370005 ×3
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin White Part 32064a Element 6548286 or 6178921 ×1

Windows and Doors 4 pieces

  • Window 1 x 2 x 3 Flat Front Red Part 60593 Element 6468353 or 6132807 ×2
  • Glass for Window 1 x 2 x 3 Flat Front Trans-Clear Part 60602 Element 6581359 or 6252258 ×2

Bars, Ladders and Fences 3 pieces

  • Bar 4L (Lightsaber Blade / Wand) Black Part 30374 Element 6116604 or 4140303 ×2
  • Cylinder 1 x 5 1/2 with Handle (Friction Cylinder) Black Part 87617 Element 6195916 or 4569407 ×1

Technic Pins 3 pieces

  • Technic Pin 1/2 with 2L Bar Extension Light Bluish Gray Part 61184 Element 6347715 or 4520320 ×3

Flags, Banners and Signs 2 pieces

  • Flag 5 x 6 Hexagonal with C Clips Red Part 51000 Element 6054540 ×2

Transportation - Sea and Air 2 pieces

  • Tail Shuttle Red Part 6239 Element 6054539 or 4170626 ×2

Bricks Wedged 1 piece

  • Brick Wedged, Sloped Inverted 4 x 4 Triple [4 Connections between Front Studs] Black Part 13349 Element 6092952 or 6030724 ×1

Minifig Accessories 1 piece

  • Equipment Telescope / Torch / Spyglass, Support Round 1 x 1 x 1 2/3 Pearl Gold Part 64644 Element 4538126 ×1

Stickers 1 piece

  • Sticker Sheet for Set 70721-1 [No Color/Any Color] Part 16050 Element 6064409 or 6056939 ×1

Technic Axles 1 piece

  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 8 x 4 x 2 with 4 Studs and Handle Trans-Brown Part 92579 Element 6507964 or 6254293 ×1

Minifigures 2 figures

  • Kai (Rebooted) Minifigure, checked as a whole figure ×1
  • General Cryptor (Rebooted) 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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