And if you are going to make them for a QB78,
the OD at the muzzle is 14mm.
(That's why I had to shim it).
The screw-on cap is a real nice feature.
Makes it easy to clean out the lead dust.
Since they only cost $24, I wonder if it
be worth it (labor wise) to build them?
They work so good, I'm thinking about ordering
a couple more to keep for air guns I may buy someday
---
You might want to check you local laws before building them.
Since they look a lot like that thing that's illegal
in some places.
Cheers,
Rich