How many pieces are in the Arin's Spinjitzu Battle Mech?

Arin's Spinjitzu Battle Mech contains 213 pieces.

What age is the Arin's Spinjitzu Battle Mech recommended for?

This set is recommended for ages 7+.

When was the Arin's Spinjitzu Battle Mech released?

Arin's Spinjitzu Battle Mech was released in 2025.

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⚠ RETIRING SOON

LEGO Arin's Spinjitzu Battle Mech set 71839

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🏛 Ninjago

Set #71839

Arin's Spinjitzu Battle Mech

Arin's Spinjitzu Battle Mech is a great entry-level Ninjago set.

Before you buy

Who it's for: Ages 7+ · Beginner build Younger Ninjago fans and those new to LEGO mechs
Build: 213 pieces · about 1.5 hours Build time is an estimate.
Price: $22.99 list price · 10.8¢ per piece
Availability: Retiring soon · expected exit Dec 31, 2026

★★★☆☆ 3.8 community rating from 30 ratings

Fans appreciate the set's playability and the unique minifigures, especially the Spectral Dragonian Warrior. Some find the mech design a bit simple compared to other Ninjago mechs, but overall it's considered a good value for younger builders.

$22.99

Best Price

$20.69

You Save

10% OFF

📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

Arin's Spinjitzu Battle Mech is a great entry-level Ninjago set. It's a fun way to introduce younger builders to the world of mechs and Spinjitzu, with a cool design that captures the essence of the Ninjago theme.

This set is perfect for younger Ninjago fans and those new to LEGO mechs. The build is straightforward and satisfying, providing a good balance between challenge and fun, plus it's very playable.

Skip this if you're a seasoned builder looking for complex techniques or a large display piece. Consider the larger Ninjago Temple sets or more intricate mechs from other themes for a more challenging build.

✨ New

Ask BlockTalk about this set

AI assistant with full set data

BlockTalk

Hi! I'm BlockTalk, your LEGO expert. Ask me anything about the Arin's Spinjitzu Battle Mech - building tips, investment potential, comparisons, or anything else!

Try asking:

How does this mech compare to other Spinjitzu mechs in terms of size and features? What are some fun ways to play with the Spinjitzu action feature? Is this set a good value for the price? How easy is it to customize this mech with other LEGO parts?

🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI

🧩

213

Pieces

⏱

1.5h

Estimated Build Time

📊

Beginner

Difficulty

👤

Ages

Build Highlights:

Simple and straightforward mech construction
Incorporates Spinjitzu action features
Bright color scheme and dynamic posing
Good introduction to Technic elements

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI

→ Price stable

B-

Investment Grade

⏳ Retiring soon

Arin's Spinjitzu Battle Mech presents a moderate investment opportunity. As a Ninjago set, it benefits from the theme's consistent popularity. Its smaller piece count and lower price point make it accessible, potentially increasing its appeal to a broader audience. While it may not experience explosive growth, the set's affordability and playability could lead to steady appreciation, especially after retirement. The presence of unique minifigures enhances its collectibility.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

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Arin's Spinjitzu Battle Mech is a great entry point into the Ninjago mech line. Compared to larger, more expensive mechs, it offers a more accessible building experience and price point. It's a good choice for younger fans or those looking for a smaller, more playable mech. Other options include similar Ninjago battle sets or smaller mechs from the Marvel or DC themes.

2 Minifigures Included

Spectral Dragonian Warrior, Ghost Lower Body

7 parts

Arin, Black Hair and Mask

5 parts

This set includes Arin with a unique mask and hair, and the Spectral Dragonian Warrior with a ghost lower body, adding to the set's collectibility.

📦 Parts Inventory

Official piece count: 213
Parts cataloged in this inventory: 69 unique parts, 201 pieces
Minifigures: 2

The official piece count includes the 12 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Brick Curved 2 x ...

Part #: 11477 10× Black

Brick Curved 2 x ...

Part #: 11477 8× Bright Light Orange

Plate Special 1 x...

Part #: 14417 2× Dark Bluish Gray

Plate Special 1 x...

Part #: 14418 2× Light Bluish Gray

Tile Round 2 x 2 ...

Part #: 14769pr9988 1× Pearl Gold

Brick Curved 2 x ...

Part #: 15068 1× Bright Light Orange

Plate Special 1 x...

Part #: 15070 2× Pearl Gold

Technic Brick Spe...

Part #: 17114 1× Dark Bluish Gray

Plate Special Rou...

Part #: 18674 1× Black

Weapon Sword / Ka...

Part #: 21459 1× Opal Trans-Clear

Tile Special 2 x ...

Part #: 22385 4× Pearl Gold

Wedge Plate 2 x 2...

Part #: 26601 4× Black

Plate Special 2 x...

Part #: 27261 5× Black

Brick 2 x 2

Part #: 3003 2× Bright Light Orange

Plate 2 x 4

Part #: 3020 1× Bright Light Orange

Plate 2 x 3

Part #: 3021 3× Black

Plate 2 x 2

Part #: 3022 4× Black

Plate 2 x 2

Part #: 3022 2× Light Bluish Gray

Plate 1 x 2

Part #: 3023 10× Trans-Dark Pink

Technic Axle and ...

Part #: 32034 2× Reddish Brown

Wedge Plate 4 x 6...

Part #: 32059 1× Black

Technic Axle 2 No...

Part #: 32062 6× Red

Creature, Dragon,...

Part #: 3215pr0001 1× Sand Blue

Brick Sloped Inve...

Part #: 32802 1× Dark Bluish Gray

Bar 1L with Clip ...

Part #: 3484 2× Dark Bluish Gray

Plate Special 1 x...

Part #: 35480 5× Black

Large Figure Weap...

Part #: 35633 1× Pearl Gold

Bracket 1 x 1 - 1...

Part #: 36840 4× Dark Bluish Gray

Plate Special 1 x...

Part #: 3839b 2× Black

Plate Round 2 x 2...

Part #: 4032a 4× Dark Bluish Gray

Plate Special 2 x...

Part #: 4304 4× Black

Wedge Plate 3 x 2...

Part #: 43722 2× Bright Light Orange

Wedge Plate 3 x 2...

Part #: 43723 2× Bright Light Orange

Bracket 1 x 2 - 2...

Part #: 44728 1× Light Bluish Gray

Dish 2 x 2 Invert...

Part #: 4740 1× Trans-Dark Pink

Brick Wedged, Cur...

Part #: 47456 1× Black

Brick Curved 2 x ...

Part #: 47457 2× Pearl Gold

Technic Tooth 1 x...

Part #: 48267 1× Pearl Gold

Brick Special 1 x...

Part #: 4920 1× White

Large Figure Cove...

Part #: 4986 2× Pearl Gold

Brick Special 1 x...

Part #: 52107 2× Black

Large Figure Weap...

Part #: 5310 1× Pearl Gold

Animal Body Part,...

Part #: 53451 2× Pearl Gold

Brick Sloped 30° ...

Part #: 54200 2× Dark Bluish Gray

Wedge Plate 6 x 3...

Part #: 54383 1× Black

Wedge Plate 6 x 3...

Part #: 54384 1× Black

Technic Brick Spe...

Part #: 57909b 4× Black

Technic Axle Conn...

Part #: 59443 4× Reddish Brown

Cone 1 x 1 [Top G...

Part #: 59900 1× Pearl Gold

Brick Sloped 65° ...

Part #: 60481 2× Black

Technic Pin with ...

Part #: 61332 2× Black

Plate Round 1 x 1...

Part #: 6141 6× Pearl Gold

Plate Round 1 x 1...

Part #: 6141 4× Trans-Dark Pink

Plate Special 1 x...

Part #: 63868 2× Dark Bluish Gray

Flame / Headwear ...

Part #: 64647 2× Trans-Dark Pink

Plate Special 4 x...

Part #: 64799 1× Dark Bluish Gray

Weapon Hilt Symme...

Part #: 66909 1× Black

Technic Brick Spe...

Part #: 67696 6× Dark Bluish Gray

Plate Round Corne...

Part #: 68568 4× Black

Plant / Animal Bo...

Part #: 69858 1× Light Aqua

Technic Brick Spe...

Part #: 73109 2× Light Bluish Gray

Plate Special 1 x...

Part #: 78256 2× Black

Plate Angled 2 x ...

Part #: 79846 1× Black

Plate Angled 2 x ...

Part #: 79846 5× Bright Light Orange

Large Figure Cove...

Part #: 79896 1× Bright Light Orange

Brick Special 2 x...

Part #: 79897 2× Bright Light Orange

Brick Special 1 x...

Part #: 80431 1× Dark Bluish Gray

Brick Round Corne...

Part #: 85080 2× Black

Brick Special 1 x...

Part #: 87087 4× Black

Plate Special 1 x...

Part #: 92692 2× Black

Arm Mechanical wi...

Part #: 98313 6× Pearl Gold

Tile Special 1 x ...

Part #: 99563 2× Bright Light Orange

Tile Special 1 x ...

Part #: 99563 2× Black

Tile Special 1 x ...

Part #: 99563 2× Pearl Gold

Bracket 1 x 2 - 1...

Part #: 99781 8× Pearl Gold

The set offers a decent selection of curved slopes and brackets in useful colors. The Pearl Gold mechanical arms could be valuable for MOC builders creating robotic or steampunk creations.

🛒 Where to Buy

LEGO (UK)

✓ In Stock

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£17.99

eBay

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$20.69 →

Walmart

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$21.84

Target

✓ In Stock

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$22.99

LEGO (US)

✓ In Stock

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$22.99

LEGO (CA)

✓ In Stock

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$24.99

💎 Notable Parts

Black Slope Curved 2 x 1 No Studs [1/2 Bow] (10x) $0.50

Trans-Dark Pink Plate 1 x 2 (10x) $0.70

Pearl Gold Bracket 1 x 2 - 1 x 2 (8x) $1.20

Bright Light Orange Slope Curved 2 x 1 No Studs [1/2 Bow] (8x) $0.40

Pearl Gold Arm Mechanical with Clip [Thick Support] (6x) $1.50

Est. BrickLink Part Value

$4.30

💡 MOC Potential

🤖 Combine with other Ninjago mechs to create a larger, more powerful robot

🚗 Rebuild into a futuristic speeder or hovercraft

🏰 Use parts to add details to a Ninjago-themed castle or fortress

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

1 video found

BlockTalk AI

Bricks By Mind appreciates the Arin's Spinjitzu Battle Mech's design mirroring the minifigure and weapon storage, but critiques the overwhelming gold knee pads and articulation. ZaziNombies LEGO, also known as Bricks By Mind, compares the official set to a custom version, appreciating the official mech's climbing hook and asymmetrical arms while feeling his custom version is more representative of Spinjitzu.

I Built Elemental Power Mechs for EVERY Ninja! (9 Mechs)

Bricks By Mind • 5.0K views Comparison

What the Community Says

1 YouTube reviews

BlockTalk AI Summary

Reddit Reviews

No Reddit reviews found

YouTube Reviews

1 video

I Built Elemental Power Mechs for EVERY Ninja! (9 Mechs)

Bricks By Mind

5.0K views Comparison

Community Content: These reviews are from Reddit and YouTube users sharing their personal experiences. Opinions may vary.

📖 Building Instructions 2

BI 3105, 76+4, 71839 V29

Download PDF

BI 3105, 76+4, 71839 V39

Download PDF

Inventory Statistics

Unique Parts

213

Official Piece Count

201

Cataloged Inventory Pieces

Minifigures

Spare Parts

The official piece count includes the 12 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Inventory Version: 1

Missing a piece? Use the Missing Piece Checker.