PolarStar
Hardware Kit, 3D Printable Split Gearbox, V2
Hardware Kit, 3D Printable Split Gearbox, V2
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Hardware Kit, 3D Printable Split Gearbox V2
The PolarStar Hardware Kit includes all required fasteners and components to assemble the free 3D printable V2 gearbox lower — no hardware store runs, no guessing on specs. Print the lower, grab this kit, and build.
What's Included:
| Qty | Part | Purpose |
| 4x | Screw, BHSC, M3 x 15mm SS | Clamshell assembly |
| 1x | Screw, BHSC, M2 x 4mm SS | Switchboard mount |
| 8x | Heat Set Insert, M3 | Clamshell + grip screw inserts |
| 1x | Heat Set Insert, M2 | Switchboard insert |
| 1x | Square Nut, M5 | Buffer tube screw |
| 1x | #23 HSS Drill Bit | Grip screw pilot holes |
| 1x | Compression Spring | Pusher piece — keeps engine seated forward |
| 2x | Bullet Valve Lead, 5" | HPA line routing |
Compatible With: Free PolarStar V2 Gearbox Lower files — download at polarstarairsoft.com/pages/creator-corner or grab the Bambu-ready 3MF on MakerWorld.
Notes: Heat set inserts require a soldering iron set to 200–230°C. Vertical clamshell holes are pre-sized after printing — no drilling needed for those locations. Grip screw pilot holes require the included #23 drill bit before insert installation.
The free 3D printable gearbox files are required to use this kit. HPA Engine, Direct Attachment Front Cylinder, and Hop Up Thing are sold separately.
Complete your build: For a full DA gearbox build you'll also need a selector plate and trigger/safety assembly. Both are available separately:
