Mercury - Airsoft grenade

Hey
This is my first serious airsoft project. The Mercury Grenade.

I want to make the simplest airsoft grenade, which is cost effective and difficult to spoil.
It is an impact grenade which works with a 6mm blank round. The operation is simple, it must fall on the top or the bottom.

Demonstration video: https://youtu.be/HNYSnt5z43M

You only need 4 different hardware

M4 16mm Tapered end grub screw
M6 28-28.5mm hexagonal screw
M6 1.5mm thick, 12.5mm diameter copper washer (it has the best tolerances)
3 Piece 2.6mm Thick, 26.8mm diameter washer

If all the Grenade parts are Printed, you only need to screw them together.
In the Pdf, you found an assembly video link.
The rubber caps are optional. Help to reduce impact damage.

For the Grenade holder:
M4 13.8mm hex screw
M4 Hexagonal Nut

Update 1:
Added the Middle slicing tolerance version. So theoretically you can print it out on any printer. I printed With Bambulab and it fit for me.

THIS IS JUST A TOY USED FOR AIRSOFT. DANGEROUS MODIFICATION MUST NOT BE MADE.

min. 0.2 LH
It works with Pla, but better something durable like ABS or Pla plus
6 wall with 0.4nozzle
30%infill

For perfect fit, you need to set Slicing tolerance to Exclusive if this setting available in the slicer.

Middle slicing tolerance version available now!
Pro tip : print the Top 1 out of Tpu if you can.