[Bigjoe11]

Would drilling holes to increase the volume make the mini shoot more like the axe? I know that the main difference pneumatics wise is the volune behind the poppet, so would this help? Also, would I be able to chrono with this large air colune behind the poppet? I am afraid that it will have the same effect as turninf the back cap out more, but thrn again, I might be able to lower the psi.

[Gryphon43]

Where are you drilling the holes?

Yes, adding volume will increase the velocity the same as turning the backcap. And yes, you can turn down the pressure to counteract this.

[Bigjoe11]

I was thinking of drilling them into the inside face of the cap. I would drill them in a circle around where the spring needs to contact.