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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.

Alien Moon Stalker

Checking

6940 Alien Moon Stalker

258 pieces in 76 part and color combinations, plus 2 minifigures.

LEGO counts 263 pieces. This inventory comes from a separate parts catalog and lists 268, including the 10 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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 62 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×2
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×7
  • Plate 1 x 3 Light Gray Part 3623 Element 362302 ×8
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×4
  • Plate 2 x 10 Light Gray Part 3832 Element 383202 ×1
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×7
  • Plate 2 x 3 Light Gray Part 3021 Element 302102 ×4
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×3
  • Plate 2 x 6 Light Gray Part 3795 Element 379502 ×5
  • Plate 2 x 8 Light Gray Part 3034 Element 303402 ×2
  • Plate 4 x 12 Light Gray Part 3029 Element 302902 ×1
  • Plate 4 x 4 Light Gray Part 3031 Element 4243813 or 303102 ×1
  • Plate 4 x 8 Light Gray Part 3035 Element 303502 ×1
  • Plate 1 x 1 Trans-Green Part 3024 Element 6513967 or 6252046 ×6
  • Plate 1 x 1 Trans-Red Part 3024 Element 6513963 or 6252042 ×10

Bricks Sloped 29 pieces

  • Brick Sloped 33° 3 x 2 with Classic Space Logo Print Light Gray Part 3298pr0039 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Light Gray Part 3040b Element 4121933 or 304002 ×12
  • Brick Sloped 45° 2 x 2 Light Gray Part 3039 Element 303902 ×3
  • Brick Sloped 45° 2 x 2 with Black Grill Print Light Gray Part 3039pr0009 ×4
  • Brick Sloped 45° 2 x 2 with Computer Panel Print Light Gray Part 3039pr9994 ×1
  • Brick Sloped 45° 2 x 4 Light Gray Part 3037 Element 303702 ×2
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Light Gray Part 3747a Element 4109695 ×6

Bricks Round and Cones 26 pieces

  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×2
  • Cone 1 x 1 [No Top Groove] Black Part 4589 Element 4518219 or 458926 ×2
  • Cone 2 x 2 x 2, Open Stud Black Part 3942c Element 6092664 or 6022160 ×2
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch Light Gray Part 3063b Element 4174798 or 306302 ×8
  • Cone 1 x 1 [No Top Groove] Trans-Red Part 4589 Element 618841 ×2
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×6
  • Cone 1 x 1 [No Top Groove] White Part 4589 Element 458901 ×2
  • Cone 2 x 2 x 2, Open Stud White Part 3942c Element 6044601 or 6022158 ×2

Hinges, Arms and Turntables 26 pieces

  • Arm Grab Jaw Black Part 4221 Element 422126 ×2
  • Arm Grab Jaw Holder, 3 Fingers Light Gray Part 4220 Element 4114366 or 4109693 ×1
  • Arm Holder Brick 2 x 2 with Hole and 1 Arm Light Gray Part 792c02 ×1
  • Arm Piece Straight with 2 and 3 Fingers Light Gray Part 3612 Element 4109694 or 610102 ×5
  • Hinge Plate 2 x 4 with Articulated Joint - Female Light Gray Part 3640 Element 364002 ×2
  • Hinge Plate 2 x 4 with Articulated Joint - Male Light Gray Part 3639 Element 363902 ×2
  • Hinge Vehicle Roof Holder 1 x 4 Light Gray Part 4315 Element 431502 ×1
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×6
  • Turntable 2 x 2 Plate, Base Light Gray Part 3680 Element 4242118 or 368002 ×6

Bricks 24 pieces

  • Brick 1 x 2 Light Gray Part 3004 Element 300402 ×5
  • Brick 1 x 4 Light Gray Part 3010 Element 301002 ×9
  • Brick 2 x 2 without Inside Ridges Light Gray Part 3003a ×8
  • Brick 2 x 4 Light Gray Part 3001 Element 4116259 or 300102 ×2

Tiles 15 pieces

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×2
  • Tile 1 x 2 with Space Computer Print Light Gray Part 3069bpr0039 Element 4163557 ×1
  • Tile 2 x 2 with Groove Light Gray Part 3068b Element 306802 ×4
  • Tile 1 x 1 with Groove Trans-Green Part 3070b Element 6581818 or 6254249 ×4
  • Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 ×4

Bricks Special 14 pieces

  • Brick Special 1 x 2 x 2/3 with Studs on Sides Black Part 4595 Element 6681661 or 4523339 ×4
  • Brick Special 1 x 1 with Headlight Light Gray Part 4070 Element 407002 ×8
  • Brick Special 2 x 2 with Pin and No Axle Hole Light Gray Part 4730 Element 473002 ×2

Windows and Doors 12 pieces

  • Glass for Window 4 x 4 x 3 Roof Black Part 4448 ×4
  • Window 4 x 4 x 6 Outward Sloping Light Gray Part 4741 ×4
  • Glass for Window 4 x 4 x 3 Roof Trans-Green Part 4448 ×4

Bars, Ladders and Fences 8 pieces

  • Lever Small Base with Black Lever Light Gray Part 298c02 Element 73588 ×4
  • Antenna 1 x 4 with Rounded Top Trans-Red Part 3957a Element 6065498 or 4106520 ×2
  • Lever Small Base with White Lever White Part 298c04 Element 6046019 or 4585623 ×2

Plates Special 6 pieces

  • Plate Special 1 x 1 with Clip Vertical [Thin U Clip] Light Gray Part 4085b ×4
  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 6mm] Light Gray Part 4623 Element 462302 ×2

Plates Wedged 6 pieces

  • Wedge Plate 3 x 4 without Stud Notches Light Gray Part 4859 ×2
  • Wedge Plate 4 x 4 Wing Left Light Gray Part 3936 Element 4248128 or 4248125 ×2
  • Wedge Plate 4 x 4 Wing Right Light Gray Part 3935 Element 4248118 or 393502 ×2

Minifig Accessories 5 pieces

  • Equipment Control Panel Black Part 2342 Element 4164402 or 234226 ×1
  • Equipment Goblet / Glass Black Part 2343 Element 6247194 or 4223189 ×2
  • Equipment Control Panel Light Gray Part 2342 Element 4109700 ×2

Containers 4 pieces

  • Box 2 x 2 x 2 Door with Slot Light Gray Part 4346 Element 434602 ×2
  • Box 2 x 2 x 2 [Solid Studs] Light Gray Part 4345a ×2

Panels 4 pieces

  • Panel 1 x 2 x 1 [Square Corners] Light Gray Part 4865a Element 486502 ×4

Plates Round Curved and Dishes 4 pieces

  • Dish 2 x 2 Inverted [Radar] Black Part 4740 Element 474026 ×2
  • Dish 2 x 2 Inverted [Radar] Trans-Red Part 4740 Element 6580377 or 6245303 ×2

Technic Bricks 4 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Light Gray Part 3700 Element 370002 ×4

Transportation - Sea and Air 4 pieces

  • Brick Special 1 x 1 with 3 Speakers / Loudspeakers / Space Positioning Rockets Black Part 3963 Element 4200791 or 396326 ×2
  • Engine - Smooth, Small 1 x 2 Side Plate [With Axle Holders] Black Part 3475b Element 347526 ×2

Technic Axles 2 pieces

  • Technic Axle 6 Black Part 3706 Element 370626 ×2

Tubes and Hoses 2 pieces

  • Flexible Hose 8.5L with Tabless Ends (Ends same color as Tube) Light Gray Part 73590c01a ×2

Windscreens and Fuselage 1 piece

  • Windscreen 6 x 4 x 2 Canopy Trans-Green Part 4474 Element 4113868 or 3006648 ×1

Minifigures 2 figures

  • Classic Spaceman, Blue with Airtanks (3842b Helmet) Minifigure, checked as a whole figure ×1
  • Classic Spaceman, Red with Airtanks (3842b Helmet) 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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