[!IMPORTANT] Official STL Files: The 3D models for the Firestar platform will be available soon on the official Polarstar Airsoft website. Stay tuned to our Discord community for the official release announcement!
Firestar – Assembly & Printing Manual 🚀
Created by: @ClutchFire3D
⚖️ License & Terms of Use
This project is licensed under CC BY-NC-ND 4.0. Commercial use, redistribution, or sale of STL files and printed parts is strictly prohibited.
📌 Table of Contents
- 1. Meet Firestar
- 2. Recommended Print Settings
- 3. Support the Mission
- Step 1: Lower Receiver Preparation
- Step 2: Upper Receiver & Handguard
- Step 3: Trigger Housing & HPA
- Step 4: Stock Adapter
- Step 5: Final System Assembly
- Step 6: Stock
1. Meet Firestar
Forget Gearboxes. Embrace Innovation.
The Firestar was developed by ClutchFire3D leveraging PolarStar Airsoft technology. Designed from the ground up to extract maximum performance from the F2™ and Jack™ HPA engines, this platform eliminates the limitations of adapted AEG bodies.
🛠 Recommended Print Settings
To ensure the structural integrity of your Firestar, follow these guidelines:
| Parameter | Recommended Setting |
|---|---|
| Material | ASA or ABS (Required for impact resistance and durability) |
| Wall Line Count | 4 layers (Crucial for thread and insert strength) |
| Infill Density | 50% or higher |
| Support | Required (Tree supports recommended for cleaner surfaces) |
| Layer Height | 0.12mm |
⚠️ Warning: Do not use standard PLA for structural parts, as it may become brittle or warp under heat and mechanical stress.
❤️ Support the Mission (Keep the Fire Burning)
The Firestar is an open-source project. If you find this project valuable, please consider supporting our work.
Step 1: Lower Receiver Preparation
Trigger
Install the trigger blade. Note the specific slot to prevent the selector from over-rotating. Secure with an M3 screw.
Grip Inserts
Using a soldering iron, install the M3 brass inserts into the Pistol Grip mounting holes.
Grip
Bolt the Pistol Grip to the body using M3 screws.
| View 1 | View 2 |
|---|---|
 |
 |
Step 2: Upper Receiver & Handguard
Inserts
Install M3 inserts into both sides of the Upper Receiver and the Outer Barrel.
Muzzle
Screw the 14mm CCW adapter onto the Outer Barrel tip.
Alignment
Align the Outer Barrel holes with the Handguard. Pay attention to the chamfered side.
| Hole Alignment | Screw Tightening |
|---|---|
 |
 |
Joining
Slide the Upper into the Handguard and secure both sides with M3 screws.
| Fitting | Hole Alignment |
|---|---|
 |
 |
Hopup
Slide the assembled Hopup and inner barrel into the Upper until it hits the internal limiter.
| Polarstar Hopup Thing | Maxx Model View |
|---|---|
 |
 |
Step 3: Trigger Housing & HPA
Trigger Board
Fix the F2 trigger board to the left side of the Housing using the original small screw.
| Trigger Housing L | Board |
|---|---|
 |
 |
Assembly
Place the trigger blade in its housing, close it with the right side, and secure with M3 screws.
| Trigger Blade | Housing Closing |
|---|---|
 |
 |
Selector
Snap the Selector Plate into place.
Step 4: Stock Adapter
Nut Setup
Place the M5 nut inside the specific slot within the Lower Receiver.
Fixation
Install the Stock Adapter before the HPA system and secure it with the M5 screw.
Step 5: Final System Assembly
Wiring
Route the FCU wires through the Stock Adapter and the air line through the Pistol Grip hole.
Trigger Box
Slide the Trigger Housing into the Lower and lock it with the Lower Pin.
Engine
Slide the F2 engine into the Upper until it seats into the Hopup.
Lock
Install the F2 Lock to prevent the engine from moving during shots.
Closing
Join the Upper and Lower receivers and lock with the front pin.
Mag Release
Install the printed (or aftermarket M4) Mag Release with the spring. Ensure smooth movement.
Step 6: Stock
Carbon Tube
Cut the carbon fiber tube to length and drill the mounting holes.
Stock
Install M3 inserts into the printed Stock part and bolt it to the tube.
Finalize
Connect the FCU and battery, tuck the wires into the tube, and slide it onto the Adapter.
| Connection | Stock Fitting |
|---|---|
 |
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🔥 Build Complete!
Share your Firestar build on Instagram and tag @ClutchFire3D.
| Join our Discord | Support the Project |
