NTA's RGO grenade for airsoft gaming

Hi!
I've been playing airsoft for a long time, and recently, I've noticed the rise of airsoft grenades that use toy explosive caps. I was never interested in them because my philosophy is that all grenades should function like real ones, with a timed fuse rather than impact. However, after learning about the Russian RGO grenade, I decided to design an airsoft impact grenade inspired by its aesthetics.

This grenade was made to use the 8 cap rings, but I recommend just using 2 or 4 caps at a time in opposite sides.

By buying this design, you agree to use them for your private use. Using these stls or 3d printed parts for commercial use is not allowed.

03/2025: Added an RGO Lower body with only 3 holes as an optional for more robustness.

WARNING: This toy uses explosive caps. Handle and Use with care to avoid injury or damage. Fire hazard. Use only in a controlled and supervised environment. Do not modify or misuse.

Bill of Materials

Parts in silver PETG or PLA: RGO lower body, spoon.

Parts in white PETG or PLA: RGO head, RGO neck, hammer, screw head part.

Parts in FLEX: Sear and RGO upper body.

Two springs OD 5mm, wire thickness 0.6 to 0.4mm, length 14mm.

One spring OD 14mm, wire thickness 1.25mm, left-hand spiral, length 75mm. You might want to use AEG springs but you need to mirror the neck and hammer so as to have right-hand spiral.

M4 x 60mm screw.

Two M4 nuts (7mm across flats).

3mm OD plastic screw, length 15mm.

2mm or 2.5mm cotter pin, total length 30mm or 35mm, and keyring.

Headless nail with a filed tip, total length 30mm.

Paint: PANTONE 5815C or any color you find closest to the real one.

I currently print them in PLA and FLEX, but I believe PETG and FLEX could be a better option. The components MUST be printed as shown in the pictures to ensure success. I recommend 3 to 4 perimeters and 5 top and bottom layers for the parts.

Printing Guidelines

The only part that requires s is the RGO head, and only on the lower section of the fuse area. Additionally, the interior of this part requires cleaning the pre-designed s (marked in blue in the part’s cross-section) in both the neck channel and the safety lever channel.
The RGO lower body has pre-designed s that must be removed (marked in blue in the part’s cross-section). Also, a slicer modifier should be applied to generate at least 8 bottom layers in the hammer impact zone.
The RGO upper body also has pre-designed s that must be removed (marked in blue in the part’s cross-section).
The hammer has pre-designed s that must be removed (marked in blue in the part’s cross-section) and should be threaded for M4. The screw head part must also be threaded.
The spoon has pre-designed s that must be removed (marked in blue in the part’s cross-section).

Assembly

Once all the s have been removed and the parts are ready for assembly, follow the process shown in the attached video: https://youtu.be/ZI0PlPOp_wM?si=-1jYiIX7Aa7Eg_ph.

The neck has a hole that needs to be aligned with the head hole to screw in the plastic screw.
When installing the sear, you will notice a circular hole in the sear that should be aligned with the hole in the RGO head to install the nail.
After installing the sear, check with the spoon for proper functioning.
When assembling the moving assembly, ensure that the flat face of the screw head part points to the screw head and must be tightly secured against the screw head. After installing the lower parts, bear in mind that the M4 screw has to protrude just short of the cap holders in the hammer.