Testing - Octo-Blast Airsoft Impact Grenade
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Description
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⚠️ATTENTION⚠️
This project is currently in the testing phase. I am looking for people willing to print, assemble, and test everything to gather as much feedback as possible.
Thanks in advance to anyone who wants to collaborate.
Updates (DD/MM/YYYY):
- 02.03.2026: creating Telegram chat to gather feedback. Please join via LINK.
- 02.03.2026: received more hardware from AliExpress. Added these M6x12mm spring ball plunger grub screws to BOM.
Current objectives:
- ensure ignition on side impacts
Octo-Blast – 7-Shot Impact Grenade for Airsoft
Smart Design. Real Impact.
A multi-shot impact grenade, economical, functional, designed by a player for players.
Octo-Blast is an airsoft impact grenade, designed to be economical, reliable, and completely 3D printable, without sacrificing performance.
The project uses .209 caliber primers and features 7 selectable shots + safety, managed via a rotating drum, which allows quick selection of the active chamber or engaging the safety.
Project Inspiration and Objectives
Octo-Blast was created with the intent of correcting the flaws of alternatives available online, while maintaining their strengths (simplicity, reliable impact, multi-shot drum system).
The main common flaws the project aims to address are:
- failed detonations
- high costs
- use of more easily available primers
The result is a more accessible grenade.
Key Features
- ✔️ Compatible with .209 primers
- ✔️ 7 shots + safety, selectable via drum rotation
- ✔️ Simple and easily inspectable mechanical system
- ✔️ Designed for home 3D printing
- ✔️ Reduced production costs compared to commercial alternatives
Important Warnings
⚠️ This model is intended exclusively for airsoft use and simulation.
⚠️ Use only .209 primers and only in contexts permitted by local regulations.
⚠️ Print, assemble, and use the model at your own risk.
Demonstration Video
Bill of Materials
| Item | Quantity |
|---|---|
| M8 Washer -- diameter: ~23.5mm, thickness: ~2mm | 6 |
| M8x50mm Bolt | 1 |
| M8x28mm Bolt (M8x30 should be fine, but I need to test it with the new components. You can always cut it) | 1 |
| M8x25mm Bolt | 1 |
| M8 Nut | 3 |
| M8 Washer -- diameter: ~17.8mm, thickness: ~1.5mm | 1 |
| M5x50mm Screw (slightly less is also fine, as long as the threaded part is approximately 45mm) | 1 |
| M4 Washer -- diameter: ~10mm, thickness: ~0.8mm | 1 |
| M5 Nut | 2 |
| Hex Socket Spring Ball Plunger Grub Screw M6x12mm | 2 |
| Compression spring -- diameter 3mm, wire thickness 0.2mm, length 30mm | 1 |
| Compression springs (*) | 2 |
(*): I am still deciding on the spring dimensions and how to fix them (pen springs should be fine, just cut them if too long. They will probably be removed from the project).
Alternatives:
- Instead of the 3 washers used to add weight to the head, you could try using tungsten putty to add more weight. The washers should weigh about 18g, while the tungsten should reach about 30g. You could also try with fishing lead.
- Another alternative to washers could be these lead washers of 30g or 20g. I will test them soon.
- A threaded rod is also fine instead of the M5 screw. You will need to cut it to the correct size in any case.
Assembly Tutorial
License
You may create derivative works based on this object, provided that all such derivative works are published exclusively on the MakerWorld platform and include proper attribution to the original creator. You may not share, upload, host, distribute, or publish this object—or any derivative work of this object—on any other digital platform, marketplace, or distribution channel. Commercial use of this object and any derivative works is strictly prohibited. This includes, but is not limited to, selling, renting, sublicensing, or using the object in any context in which you receive monetary compensation or other financial benefits.
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