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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.

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7699 MT-101 Armored Drilling Unit

616 pieces in 184 part and color combinations, plus 5 minifigures.

The official piece count includes the 19 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. 3 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 21 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.

Plate 2 x 8 Black ×1 Dark Bluish Gray ×13 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Angled #1 Black ×5 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 4 Cut Corner Black ×2 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Pins 70 pieces

Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×3
Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 4 spares in the box ×30
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×11
Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 3 spares in the box ×11
Technic Pin 3/4 Dark Bluish Gray Part 32002 Element 32002199 or 4211050 3 spares in the box ×7
Technic Pin Double with Axle Hole Light Bluish Gray Part 32138 Element 4211888 ×2
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×6

Technic Bushes 42 pieces

Technic Bush Red Part 3713 Element 6271820 or 4227155 3 spares in the box ×28
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 2 spares in the box ×14

Plates Special 26 pieces

Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 ×2
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Black Part 4081b Element 6281993 or 4632571 ×2
Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×4
Bracket 1 x 2 - 2 x 2 Light Bluish Gray Part 44728 Element 6117967 or 6009014 ×6
Plate Special 1 x 2 Side Handle [Free Ends] Light Bluish Gray Part 2540 Element 4211632 ×3
Plate Special 2 x 2 with 2 Pin Holes Light Bluish Gray Part 2817 Element 4211376 ×2
Plate Special 4 x 4, Studs on One Edge Plain] Light Bluish Gray Part 6179 Element 4211837 ×4
Bracket 1 x 2 - 2 x 2 White Part 44728 Element 6619296 or 6117940 ×1
Plate Special 1 x 2 with Door Rail White Part 32028 Element 6550168 or 4249563 ×2

Technic Bricks 25 pieces

Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×4
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Black Part 32064b ×2
Technic Brick 1 x 14 [13 Pin Holes] Dark Bluish Gray Part 32018 Element 4211137 ×2
Technic Brick 1 x 12 [11 Pin Holes] Light Bluish Gray Part 3895 Element 4211860 ×2
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Light Bluish Gray Part 32064b ×4
Technic Brick 1 x 8 [7 Pin Holes] Light Bluish Gray Part 3702 Element 4211442 ×2
Technic Brick 1 x 2 [1 Pin Hole] White Part 3700 Element 6619284 or 370001 ×4
Technic Brick 1 x 4 [3 Pin Holes] White Part 3701 Element 6601913 or 370101 ×1
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Yellow Part 32064b ×4

Bricks 24 pieces

Brick 1 x 8 Black Part 3008 Element 300826 ×1
Brick 2 x 6 Dark Bluish Gray Part 2456 Element 4282819 or 4210875 ×2
Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×4
Brick 1 x 10 White Part 6111 Element 6619291 or 611101 ×3
Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×2
Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×7
Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×3
Brick 2 x 10 White Part 3006 Element 4617855 or 300601 ×2

Plates Round Curved and Dishes 20 pieces

Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Bluish Gray Part 2654 Element 4278273 or 4276273 ×2
Plate Round 1 x 1 with Solid Stud Trans-Dark Blue Part 6141 Element 6514055 or 6240214 1 spare in the box ×2
Plate Round 1 x 1 with Solid Stud Trans-Orange Part 6141 Element 6514059 or 6240227 3 spares in the box ×8
Dish 3 x 3 Inverted [Radar] White Part 43898 Element 4179580 ×2
Dish 6 x 6 Inverted, Radar / Webbed [Anti-studs at 90°] White Part 4285b Element 6024943 or 4501985 ×6

Bricks Sloped 18 pieces

Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2
Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×2
Brick Sloped Inverted 34° 3 x 1 with Internal Stopper Light Bluish Gray Part 4287b ×2
Brick Sloped 45° 2 x 1 with Bottom Pin Orange Part 3040b Element 4121967 or 4118901 ×2
Brick Sloped 33° 3 x 1 White Part 4286 Element 6632142 or 428601 ×4
Brick Sloped 45° 10 x 2 x 2 Double White Part 30180 Element 4502027 or 4110051 ×1
Brick Sloped 45° 2 x 2 Double Convex White Part 3045 Element 4233370 or 304501 ×2
Brick Sloped 45° 2 x 2 with Green Radar, Green/Red Buttons and Disk Slot Print White Part 3039pr0002 Element 4195659 ×1
Brick Sloped 45° 2 x 4 White Part 3037 Element 6552102 or 303701 ×2

Bricks Round and Cones 17 pieces

Brick Round Corner 10 x 10 with Slope 33° Edge, Axle Hole, Facet Cutout Black Part 58846 Element 6454174 or 6015466 ×2
Brick Round 2 x 2 with Axle Hole Dark Bluish Gray Part 3941 Element 4249139 ×1
Cone 1 x 1 [No Top Groove] Trans-Dark Blue Part 4589 Element 618843 ×6
Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×8

Tiles Special 15 pieces

Tile Special 2 x 3 with 2 Clips [Thick U Clips] Black Part 30350c ×4
Tile Special 1 x 2 with Handle Light Bluish Gray Part 2432 Element 4211357 ×1
Tile Special 1 x 2 Grille with Bottom Groove Orange Part 2412b Element 4125254 or 3933106 ×9
Tile Special 1 x 2 with Handle White Part 2432 Element 243201 ×1

Tiles 13 pieces

Tile 1 x 2 with Joystick and Vehicle Control Panel Print Dark Bluish Gray Part 3069bpr0090 Element 4221879 ×1
Tile 1 x 2 with Red 82, Yellow and White Gauges Print Light Bluish Gray Part 3069bpr0101 Element 4227776 ×2
Tile 1 x 2 with Stylised Computer Console Print Light Bluish Gray Part 3069bpr0086 Element 4212363 ×1
Tile 1 x 8 with Groove Light Bluish Gray Part 4162 Element 4211481 ×1
Tile 1 x 2 with Groove Trans-Dark Blue Part 3069b Element 6514219 or 6251289 ×4
Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×4

Bricks Curved 12 pieces

Brick Curved 1 x 2 x 1 1/3 with Curved Top Black Part 6091 Element 6383142 or 6184784 ×2
Brick Curved 1 x 2 x 1 1/3 with Curved Top White Part 6091 Element 6285777 or 609101 ×2
Brick Curved 1 x 3 x 2 White Part 33243 Element 4141668 or 4128644 ×6
Brick Curved 6 x 1 White Part 42022 Element 4160387 ×2

Large Buildable Figures 9 pieces

Large Figure Limb Cover (Toa Inika) Black Part 53543 Element 4281239 ×1
Large Figure Skeletal, Limb, Angular with Ball Joint, and Axle Hole Black Part 32476 Element 4291516 or 4234445 ×6
Large Figure Weapon Spear, Drill with Axle and Hole Black Part 40340 Element 4507190 or 4227078 ×1
Large Figure Skeletal, Torso, Lower Section (Rahkshi) Dark Bluish Gray Part 44135 Element 4210938 ×1

Tubes and Hoses 8 pieces

Axle Hose, Soft 11L Dark Bluish Gray Part 32199 Element 4292000 or 4210650 ×1
Flexible Ribbed Hose 8mm Ends 19L Orange Part 57539 Element 4561469 or 4508092 ×1
Hose, Ribbed 7mm D. 4L / 3.2cm Pearl Light Gray Part 78c04 Element 4495200 or 4275389 1 spare in the box ×6

Wheels and Tyres 8 pieces

Wheel Hard Plastic Giant (71mm D. x 47mm) Orange Part 2573 Element 4508724 ×6
Wheel Hard Plastic Small (22mm D. x 24mm) Orange Part 6118 Element 4505861 ×2

Bricks Wedged 7 pieces

Brick Wedged, Curved 6 x 2 Left, Inner Ridges White Part 41748 Element 6552117 or 4160124 ×2
Brick Wedged, Curved 6 x 2 Right, Inner Ridges White Part 41747 Element 4160101 ×2
Brick Wedged, Curved Triple 4 x 4 x 2/3, 2 Studs White Part 45677 Element 4193068 or 456771 ×2
Brick Wedged, Curved Triple 4 x 6 x 2/3 with 4 Studs White Part 52031 Element 4261565 ×1

Rock 6 pieces

Rock 1 x 1 Jewel / Gem 24 Facet Trans-Neon Green Part 30153 Element 6247790 or 4114505 ×6

Bars, Ladders and Fences 5 pieces

Bar 1 x 4 x 2 Black Part 6187 Element 4141349 or 4121537 ×1
Bar 1 x 8 with Brick 1 x 2 Curved Top End (Axle Holder Inside Small End) Dark Bluish Gray Part 30359b Element 6273322 or 4210815 ×2
Lever Small Base with Black Lever White Part 298c02 Element 73737 1 spare in the box ×2

Bricks Special 4 pieces

Brick Special 1 x 2 with Handle Black Part 30236 Element 4288212 or 4113243 ×2
Brick Special 1 x 1 with Studs on 2 Sides Dark Bluish Gray Part 47905 Element 4213574 ×2

Panels 4 pieces

Panel 3 x 2 x 6 Trans-Orange Part 2466 Element 4507003 ×1
Panel 1 x 2 x 1 [Square Corners] White Part 4865a Element 486501 ×1
Panel 1 x 4 x 1 with Rounded Corners [Thick Wall] White Part 43337 Element 4173477 ×2

Projectiles / Launchers 4 pieces

Large Figure Weapon, Zamor Sphere Launcher Pearl Dark Gray Part 54271 Element 4288099 ×1
Projectile, Large Figure Weapon, Zamor Sphere / Ball Trans-Medium Blue Part 54821 Element 4585759 or 4296577 ×3

Windscreens and Fuselage 4 pieces

Windscreen 10 x 6 x 2 Curved Trans-Orange Part 45705 Element 6507926 or 6386002 ×2
Slope, Curved 8 x 8 x 2 Double with Cutout White Part 54096 Element 6302525 or 6109976 ×2

Transportation - Sea and Air 3 pieces

Technic Cylinder 4 x 4 with Pin Holes and Centre Bar, Closed Sides on Bar Black Part 41531 Element 6116995 or 4262615 ×1
Propeller 8 Blade 5 Diameter Light Bluish Gray Part 41530 Element 6035418 or 4159341 ×2

Animal / Creature Body Parts 2 pieces

Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section Lime Part 40379 Element 6293393 or 6172469 ×2

Minifig Accessories 2 pieces

Equipment Martian Hypersled with Pin (Mars Mission) White Part 58843 Element 4501924 ×2

Minifig Shields, Weapons, & Tools 2 pieces

Weapon Gun / Torch (Space) [with Grooves] Dark Bluish Gray Part 3959 Element 4262540 or 4242182 ×2

Technic Special 2 pieces

Cylinder 9 x 4 x 2 Tapered with Flat Bottom, Pin Holes Trans-Orange Part 58947 Element 4502233 ×2

Animal / Creature Accessories 1 piece

Animal / Creature Accessory, Horse Hitching, 1 x 2 Plate and 2 x 2 Plate [Studded] Dark Bluish Gray Part 2397 Element 4268684 ×1

Stickers 1 piece

Sticker Sheet for Set 7699-1 [No Color/Any Color] Part 60184 Element 4508874 ×1

Technic Beams Special 1 piece

Technic Beam 1 x 2 with Ball Joint Angled Dark Bluish Gray Part 50923 Element 4503381 or 4289258 ×1

Technic Gears 1 piece

Technic Worm Gear Light Bluish Gray Part 4716 Element 4211510 ×1

Transportation - Land 1 piece

Mudguard 2 x 4 with 2 x 2 Studs and Flared Wings Dark Bluish Gray Part 41854 Element 6602848 or 4210812 ×1

Minifigures 5 figures

Martian Minifigure, checked as a whole figure ×2
Mars Astronaut, Orange Sunglasses, Stubble Minifigure, checked as a whole figure ×1
Mars Astronaut, Stubble, Printed Hair Minifigure, checked as a whole figure ×1
Mars Astronaut, Stubble, Printed Hair over Eyes 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.