Cheers

Good point about removing metal. I saw someone do this on YouTube.

Shame about the barrel. Mines more accurate than I am. I find the hold sensitivity / inconsistent technique on my side and head position / parallex throws a group out for me. It clover leafs at 17 yards. In more skilled hands I'd imagine the groups would tigthen further.

Is the barrel locking consistently?

Did you use 6mm rod?