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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.

Checking

72005 Aaron's X-bow

543 pieces in 168 part and color combinations, plus 4 minifigures.

The official piece count includes the 26 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. 1 part in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 15 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

Brick Curved 2 x 2 x 2/3 Black ×1 Dark Blue ×13 Black is yellower and darker than Dark Blue.

Piece checklist

Technic Pins 81 pieces

Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×17
Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×4
Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×35
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×4
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×8
Technic Pin 1/2 with 2L Bar Extension Light Bluish Gray Part 61184 Element 6347715 or 4520320 ×4
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×6
Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×2
Technic Pin Long without Friction Ridges Tan Part 32556 ×1

Tiles 27 pieces

Tile 1 x 6 with Groove Dark Blue Part 6636 Element 4252437 ×9
Tile 2 x 4 with Groove Dark Blue Part 87079 Element 4569836 ×2
Tile 1 x 2 with Groove Pearl Gold Part 3069b Element 6107197 ×14
Tile 1 x 2 with Groove Trans-Bright Green Part 3069b Element 6502368 or 6251298 ×2

Plates Round Curved and Dishes 26 pieces

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout Black Part 35044 Element 6208787 ×2
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Bluish Gray Part 2654 Element 4278273 or 4276273 ×1
Dish 2 x 2 Inverted [Radar] Trans-Bright Green Part 4740 Element 6589436 or 6518820 ×2
Plate Round 1 x 1 with Solid Stud Trans-Bright Green Part 6141 Element 6514053 or 6240206 1 spare in the box ×5
Plate Round 1 x 1 with Solid Stud Trans-Neon Orange Part 6141 Element 6240218 or 3005747 1 spare in the box ×14
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Neon Orange Part 2654 Element 6171734 or 6124909 ×2

Bricks Curved 24 pieces

Brick Curved 2 x 2 x 2/3 Black Part 15068 Element 6053077 Also in Dark Blue ×1
Brick Curved 3 x 1 No Studs Black Part 50950 Element 4251161 ×2
Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Blue Part 11477 Element 6554198 or 6094143 ×4
Brick Curved 2 x 2 x 2/3 Dark Blue Part 15068 Element 6554196 or 6061569 Also in Black ×13
Brick Curved 4 x 1 Double, No Studs Dark Blue Part 93273 Element 6037886 ×1
Brick Curved 6 x 1 Dark Bluish Gray Part 42022 Element 6058858 or 4210778 ×2
Brick Curved 3 x 2 No Studs Light Bluish Gray Part 24309 Element 6132207 ×1

Technic Axles 20 pieces

Technic Axle 4 Black Part 3705 Element 370526 ×6
Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×2
Technic Axle 2 Notched Red Part 32062 Element 4142865 ×8
Technic Axle 4 Red Part 3705 Element 6129995 or 4265797 ×4

Plates Wedged 18 pieces

Wedge Plate 12 x 3 Left Dark Blue Part 47397 Element 4647621 or 4283827 ×3
Wedge Plate 12 x 3 Right Dark Blue Part 47398 Element 4647622 or 4283828 ×3
Wedge Plate 2 x 2 Cut Corner Dark Blue Part 26601 Element 6164071 ×4
Wedge Plate 4 x 9 with Stud Notches Light Bluish Gray Part 14181 Element 6048848 ×1
Wedge Plate 2 x 4 Lime Part 51739 Element 6464975 or 6025027 ×1
Wedge Plate 3 x 2 Left Lime Part 43723 Element 4539907 or 4183168 ×2
Wedge Plate 3 x 2 Right Lime Part 43722 Element 4539908 or 4183167 ×2
Wedge Plate 3 x 6 Cut Corners Lime Part 2419 Element 6185123 or 4227516 ×2

Projectiles / Launchers 17 pieces

Launcher, Plate Special 1 x 2 with Mini Blaster Black Part 15403 Element 6102734 ×4
Launcher Trigger, Weapon Gun Trigger Dark Bluish Gray Part 15392 Element 6051334 1 spare in the box ×6
Launcher, Brick Special 1 x 4 Spring Shooter with Light Bluish Gray Top Dark Bluish Gray Part 15400 Element 6324200 or 6048898 ×2
Launcher, Weapon Gun / Blaster / Shooter Flat Silver Part 22487 Element 6131790 ×2
Projectile, Spring Shooter Ammunition 8L Bar Trans-Neon Orange Part 15303 Element 6124908 ×3

Technic Beams 13 pieces

Technic Beam 1 x 5 Thin with Axle Holes on Ends Black Part 11478 Element 6327028 or 6030286 ×2
Technic Beam 1 x 3 Thin Blue Part 6632 Element 6344176 or 4107829 ×1
Technic Beam 1 x 15 Thick Dark Blue Part 32278 Element 6151070 or 6058997 ×4
Technic Beam 1 x 2 Thin Light Bluish Gray Part 41677 Element 6348143 or 4211741 ×2
Technic Beam 1 x 4 Thin with Stud Connector Light Bluish Gray Part 2825 Element 6331574 or 4211561 ×4

Bricks 9 pieces

Brick 1 x 4 Dark Blue Part 3010 Element 4264569 ×2
Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×5
Brick 2 x 4 Lime Part 3001 Element 4165967 or 4122453 ×2

Bars, Ladders and Fences 8 pieces

Bar 1L with Top Stud and Two Side Studs Pearl Gold Part 92690 Element 6328909 or 4640843 ×1
Bar 3L Pearl Gold Part 87994 Element 6093529 or 6078895 1 spare in the box ×1
Bar 2L with Towball Trans-Bright Green Part 22484 Element 6360113 or 6139234 ×2
Bar 2L with Towball Trans-Neon Orange Part 22484 Element 6131711 ×2
Bar 4L (Lightsaber Blade / Wand) Trans-Neon Orange Part 30374 Element 6288243 or 6120914 ×2

Technic Bricks 8 pieces

Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×2
Technic Brick 1 x 16 [15 Pin Holes] Dark Bluish Gray Part 3703 Element 4256828 ×2
Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Dark Bluish Gray Part 32064a Element 6178919 or 4210935 ×2
Technic Brick 1 x 1 with Pin Hole Yellow Part 6541 Element 654124 ×2

Minifig Shields, Weapons, & Tools 7 pieces

Weapon Harpoon [Smooth Shaft] Flat Silver Part 18041 Element 6162578 or 6078471 1 spare in the box ×2
Shield Pentagonal Pearl Gold Part 22408 Element 6202742 ×2
Weapon Harpoon [Smooth Shaft] Pearl Gold Part 18041 Element 6162580 or 6121352 1 spare in the box ×2
Weapon Pike / Spear Flat End Pearl Titanium Part 93789 Element 4614336 or 4613935 ×1

Bricks Round and Cones 6 pieces

Brick Round 2 x 2 Truncated Cone Light Bluish Gray Part 98100 Element 6028324 ×2
Cone 1 x 1 [Top Groove] Trans-Neon Orange Part 59900 Element 6301326 or 6172239 ×4

Wheels and Tyres 6 pieces

Wheel Hard Plastic, Treaded with 7 Pin Holes (37mm D. x 22mm) Pearl Titanium Part 22410 Element 6122170 ×2
Technic Wedge Belt Wheel [aka Pulley] Trans-Neon Orange Part 4185 Element 6124680 or 4172601 ×4

Bricks Special 5 pieces

Brick Special 2 x 2 with 2 Pins and Axle Hole Blue Part 30000 Element 3000023 ×1
Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side Light Bluish Gray Part 22885 Element 6123809 ×2
Brick Special 1 x 4 with 4 Studs on One Side Light Bluish Gray Part 30414 Element 4211636 ×2

Minifig Headwear Accessories 4 pieces

Headwear Accessory Helmet Wing with Pin Trans-Bright Green Part 35042 Element 6205442 2 spares in the box ×4

Technic Bushes 4 pieces

Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×4

Technic Gears 4 pieces

Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×2
Technic Driving Ring Extension, 4 Ridges Flat Silver Part 32187 Element 6123838 ×2

Technic Special 4 pieces

Technic Brick 1 x 2 with Hole and Dual Beam Extensions Dark Bluish Gray Part 85943 Element 6324639 or 4547958 ×4

Animal / Creature Accessories 3 pieces

Insect Accessory, Spider Head and Legs Flat Silver Part 35039 Element 6208782 ×3

Transportation - Sea and Air 3 pieces

Helicopter Landing Ski 1 x 6 with Pin Hole Dark Bluish Gray Part 15540 Element 6068029 ×3

Bricks Wedged 2 pieces

Brick Wedged, Sloped 4 x 4 Pointed Dark Blue Part 22391 Element 6129858 ×2

Hinges, Arms and Turntables 2 pieces

Hinge Brick 2 x 2 Top Plate Thin Black Part 6134 Element 4124096 or 613426 ×1
Hinge Brick 1 x 2 Base Light Bluish Gray Part 3937 Element 4211469 ×1

Technic Beams Special 2 pieces

Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×2

Tiles Round and Curved 2 pieces

Tile Round 1 x 1 Black Part 98138 Element 6284070 or 6139403 1 spare in the box ×2

Windows and Doors 2 pieces

Door 1 x 3 x 1 Left Lime Part 3822 Element 6207461 ×1
Door 1 x 3 x 1 Right Lime Part 3821 Element 6207460 ×1

Large Buildable Figures 1 piece

Large Figure Weapon, Sword 1 x 13 with 1x2 Plate, Angled Side Extensions, Textured Panel Inset with Hexagons Trans-Neon Orange Part 27934 Element 6166860 ×1

Stickers 1 piece

Sticker Sheet for Set 72005-1 [No Color/Any Color] Part 36975 Element 6214704 ×1

Technic Steering, Suspension and Engine 1 piece

Technic Shock Absorber 6.5L with Hard Spring, Tight Coil in Middle [Complete Assembly] Red Part 76537 Element 6144791 ×1

Transportation - Land 1 piece

Handlebars Dark Bluish Gray Part 30031 Element 4261908 or 4210644 ×1

Windscreens and Fuselage 1 piece

Windscreen 10 x 4 x 2 1/3 with Handle Trans-Neon Orange Part 27165 Element 6240035 or 6166861 ×1

Minifigures 4 figures

Aaron Fox with Trans-Neon Orange Visor Minifigure, checked as a whole figure ×1
VanByter No. 307 Minifigure, checked as a whole figure ×1
Robin Underwood with Helmet Minifigure, checked as a whole figure ×1
CyberByter 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.