Missing Piece Checker: 71805 Jay's Mech Battle Pack

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71805 Jay's Mech Battle Pack

61 pieces in 34 part and color combinations, plus 4 minifigures.

The official piece count includes the 17 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. Compare each color with the step's parts callout, especially White against Trans-Clear.
The spare pieces. This set comes with 4 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.

Piece checklist

Plates Special 18 pieces

Plate Special 1 x 2 with 2 End Towballs Black Part 3170 Element 6416838 ×1
Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Black Part 60470b Element 6310268 or 4556158 ×1
Plate Special, 2 x 2 Studs and Handle, Closed Ends (Mech Chest Plate / Armor) Blue Part 27167 Element 6463374 ×1
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Blue Part 15573 Element 6554197 or 6092588 ×2
Plate Special 1 x 2 with 5.9mm Towball Socket and Towball Dark Bluish Gray Part 14419 Element 6414554 or 6338166 ×4
Plate Special 1 x 2 with End Towball Dark Bluish Gray Part 22890 Element 6370802 or 6338168 ×2
Cockpit 4 x 2 x 3 with Pin Hole, and 2 Clips Light Bluish Gray Part 98876 Element 6453106 ×1
Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×4
Plate Special 1 x 2, Top Clip [Open O] Light Bluish Gray Part 44861 Element 6326078 ×2

Plates Round Curved and Dishes 9 pieces

Plate Special 1 x 2 Rounded with 2 Open Studs Bright Light Yellow Part 35480 Element 6296501 ×5
Plate Round 1 x 1 with Solid Stud Trans-Light Blue Part 6141 Element 6514058 or 6240225 1 spare in the box ×4

Bricks Sloped 7 pieces

Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate Blue Part 61409 Element 4597338 ×2
Brick Sloped 30° 1 x 2 x 2/3 Dark Blue Part 85984 Element 6554210 or 6216905 ×2
Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud Dark Blue Part 28192 Element 6166857 ×1
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Dark Blue Part 3660 Element 6025375 or 4590785 ×2

Minifig Shields, Weapons, & Tools 6 pieces

Weapon Bladed Claw Spread Flat Silver Part 10187 Element 6004345 1 spare in the box ×2
Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Pearl Gold Part 21459 Element 6116596 ×2
Weapon Sword / Saber with Curved Blade and Hilt Pearl Gold Part 25111 Element 6245239 ×1
Weapon Crossbow and Bolt Pearl Titanium Part 2570 Element 6268844 or 4617248 ×1

Bricks Curved 4 pieces

Brick Curved 2 x 2 x 2/3 Blue Part 15068 Element 6116786 ×1
Brick Curved Inverted 2 x 2 x 2/3 Light Bluish Gray Part 32803 Element 6185676 ×1
Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Pearl Gold Part 47457 Element 4286597 ×2

Projectiles / Launchers 4 pieces

Launcher Trigger, Weapon Gun Trigger Dark Bluish Gray Part 69755 Element 6360675 1 spare in the box ×2
Launcher, Plate Special 1 x 2 with Mini Blaster Square Pearl Titanium Part 69754 Element 6345952 ×2

Large Buildable Figures 3 pieces

Fin Jagged with Axle Hole Pearl Gold Part 76919 Element 6342592 ×1
Large Figure Armor Plate, Small Pearl Gold Part 28220 Element 6463373 ×2

Minifig Accessories 2 pieces

Tassel with 1 x 1 Round Stud Pearl Gold Part 25375 Element 6274711 or 6251548 ×2

Tiles Special 2 pieces

Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Pearl Gold Part 99563 Element 6207933 or 4651407 ×2

Bars, Ladders and Fences 1 piece

Bar 6L with Stop Ring Reddish Brown Part 63965 Element 6170468 or 6155727 ×1

Bricks Round and Cones 1 piece

Cone 1 x 1 [Top Groove] Pearl Gold Part 59900 Element 4529247 ×1

Technic Axles 1 piece

Technic Axle 2 Notched Red Part 32062 Element 4142865 ×1

Technic Bricks 1 piece

Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate Light Bluish Gray Part 73109 Element 6326478 ×1

Technic Pins 1 piece

Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×1

Tiles Round and Curved 1 piece

Tile Round 2 x 2 with Dragon Head, White Gear in Dark Azure Circle Print Pearl Gold Part 14769pr9988 Element 6467216 ×1

Minifigures 4 figures

Wolf Mask Warrior, Shoulder Pads Minifigure, checked as a whole figure ×1
Wolf Mask Guard Minifigure, checked as a whole figure ×1
Jay, Wrap Minifigure, checked as a whole figure ×1
Lloyd, White Suit, Hair 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.

LEGO Missing Piece Checker

71805 Jay's Mech Battle Pack

Before you call it missing

Your missing list