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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.

Iron Man Mech vs. Ultron

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76307 Iron Man Mech vs. Ultron

92 pieces in 42 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

Dark Red 30 pieces

  • Brick Curved 2 x 2 x 2/3 Dark Red Part 15068 Element 6107758 ×6
  • Brick Curved 3 x 2 No Studs Dark Red Part 24309 Element 6264031 ×1
  • Brick Sloped 30° 1 x 2 x 2/3 Dark Red Part 85984 Element 6083977 ×2
  • Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Dark Red Part 15672 Element 6251611 ×4
  • Brick Wedged, Sloped 45° 2 x 4 Triple Dark Red Part 47759 Element 6525969 or 6222273 ×2
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Dark Red Part 2654 Element 6192839 ×3
  • Plate Special, 2 x 2 Studs and Handle, Closed Ends (Mech Chest Plate / Armor) Dark Red Part 27167 Element 6440776 ×1
  • Tile 2 x 2 with Sand Green/White Rectangle Arc Reactor Print Dark Red Part 3068bpr9329 Element 6526664 ×1
  • Tile Round 1 x 1 Quarter Dark Red Part 25269 Element 6311890 1 spare in the box ×2
  • Tile Round 2 x 2 with Bottom Stud Holder Dark Red Part 14769 Element 6264149 ×2
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Dark Red Part 99563 Element 6448315 ×6

Dark Bluish Gray 17 pieces

  • Bar 2L with Towball Dark Bluish Gray Part 22484 Element 6364352 or 6360117 ×2
  • Bracket 1 x 1 - 1 x 2 Dark Bluish Gray Part 79389 Element 6435043 ×2
  • Brick Curved Inverted 2 x 2 x 2/3 Dark Bluish Gray Part 32803 Element 6344820 ×1
  • Brick Sloped Inverted 45° 4 x 1 Double with 1 x 2 Recessed Dark Bluish Gray Part 32802 Element 6185675 ×2
  • Cockpit 4 x 2 x 3 with Pin Hole, and 2 Clips Dark Bluish Gray Part 98876 Element 6384443 ×1
  • Launcher Trigger, Weapon Gun Trigger Dark Bluish Gray Part 69755 Element 6360675 1 spare in the box ×2
  • Plate Special 1 x 2 with End Towball Dark Bluish Gray Part 22890 Element 6370802 or 6338168 ×2
  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Half Hollow Anti-stud] - Updated Version Dark Bluish Gray Part 4304 Element 6469463 ×1
  • Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Dark Bluish Gray Part 18674 Element 6115080 ×2
  • Technic Plate 2 x 4 [3 Holes] Dark Bluish Gray Part 3709 Element 4227398 ×2

Pearl Gold 15 pieces

  • Animal / Creature Body Part, Claw with Clip Pearl Gold Part 3171 Element 6426622 ×4
  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Pearl Gold Part 47457 Element 4286597 ×2
  • Brick Wedged, Curved 2 x 3 x 2/3 Two Studs, Wing End Pearl Gold Part 47456 Element 6357918 or 4286599 ×2
  • Launcher, Plate Special 1 x 2 with Mini Blaster Square Pearl Gold Part 69754 Element 6345949 ×2
  • Plate Angled 2 x 2 with Step and Hole in Center Pearl Gold Part 79846 Element 6525970 ×4
  • Plate Special 1 x 2 [Side Handle Closed Ends] Pearl Gold Part 48336 Element 4585493 ×1

Dark Tan 10 pieces

  • Bracket 1 x 2 - 1 x 2 Dark Tan Part 99781 Element 6328477 ×3
  • Plate Special 1 x 2 Rounded with 2 Open Studs Dark Tan Part 35480 Element 6231386 ×2
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Dark Tan Part 60478 Element 6135607 ×1
  • Tile Special 2 x 2 Inverted Dark Tan Part 11203 Element 6406008 ×2
  • Wedge Plate 2 x 4 Dark Tan Part 51739 Element 6003379 ×2

Light Bluish Gray 7 pieces

  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×6
  • Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate Light Bluish Gray Part 73109 Element 6326478 ×1

Trans-Light Blue 6 pieces

  • Dish 2 x 2 Inverted [Radar] Trans-Light Blue Part 4740 Element 6580378 or 6245307 ×2
  • Tile Round 1 x 1 Trans-Light Blue Part 98138 Element 6514192 or 6274739 1 spare in the box ×4

Trans-Red 3 pieces

  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×2
  • Projectile, Spring Shooter Ammunition 8L Bar Trans-Red Part 15303 Element 6287550 or 6054526 ×1

Black 2 pieces

  • Plate Special 1 x 2 with 2 End Towballs Black Part 3170 Element 6416838 ×1
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×1

Opal Trans-Light Blue 1 piece

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Opal Trans-Light Blue Part 2654 Element 6581777 or 6350385 ×1

Trans-Clear 1 piece

  • Plate Special Round 1 x 1 with Hollow Stud and Bar on Underside - Long Space Trans-Clear Part 79194 Element 6510217 or 6359231 1 spare in the box ×1

Minifigures 2 figures

  • Iron Man, Pearl Gold Arms, Round Arc Reactor, Helmet and Visor Minifigure, checked as a whole figure ×1
  • Ultron 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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