I designed these shoulder stocks for Shockwave RD-15 blaster, but it should work with any blaster with standardized detachable stock system. I tested it with PETG, it works great, fits tight and requires some force to remove. No supports or screws required!

I uploaded two versions - short and long. My 6 years old son prefers shorter one as he can reach charging handle easier. Longer one is better for teenagers and adults. Enjoy!

EDIT:

Upon request, I uploaded 250 mm version of this model as well. Stocks lengths:
- short: 105 mm
- long: 175 mm
- longest: 250 mm

Enjoy!