[ybrik]

I was thinking about doing that this morning but it would not make any sense. As right now with the stock spring and systema spring guide, I'm having no issues. That means the piston clears the sector with that spring guide.

Now even if I had to put back the stock POM plastic spring guide to buy space, with the fully compressed sp130, it would still not clear the piston.

Yup, bore-up it is. A slight BU deviation on the cylinder head's outer diameter should not cause an issue, but with this Gbox, it would.

I'll try to swap a standard metal cylibder head with double o-ring next time.