Set Details
- Set Number
- 71720
- Name
- Fire Stone Mech
- Theme
- Ninjago
- Year
- 2020
- Pieces
- 977
- Complexity
- Advanced
- Build Time
- 4-8 hours
- Ages
- 14+
- Type
- Both play and display
About LEGO Fire Stone Mech
LEGO Fire Stone Mech (set #71720) is a large, detailed build with 977 pieces from the Ninjago theme, released in 2020. The Ninjago line features ninja-themed action sets with spinners, mechs, and dragons. At 977 pieces, this is a advanced-level build with an estimated build time of 4-8 hours, suitable for ages 14+.
Set Highlights
- 977 pieces at advanced complexity — a 4-8 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Versatile build — display-worthy when complete, durable enough for active play.
Who Is This Set For?
Gift for Ages 14+
The advanced difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 14+ age range.
Weekend Build Project
977 pieces with an estimated 4-8 hours fits comfortably into a focused afternoon or weekend session.
Expanding a Ninjago Collection
A solid addition for collectors building out their Ninjago shelf. Introduces parts and builds that complement other sets from the same line.
Build Tips
A five-minute sort by color or piece type before starting saves time hunting for specific bricks mid-step.
Follow the numbered steps in sequence — structural elements early in the build support everything that comes after.
For active play sets, key connection points (hinges, turntables, clip joints) can loosen over time — a small dab of LEGO's own tube clutch lubricant on the stud resolves most looseness without damage.
Finding Instructions
Building instructions for LEGO Fire Stone Mech (#71720) are available as a free PDF on LEGO.com. You can also upload a photo of this set to LegoFinder to identify it and access the instructions directly.
Fire Stone Mech FAQ
Related Reading
More Ninjago Sets
See all Ninjago →
Also Released in 2020
All 2020 sets →Similar Build Difficulty
Sets at roughly the same piece count and complexity tier — different theme and year, but a similar build experience.
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