The reg is never set on a Mini. The arrow as you call it will set to 200ish when your tank is attached. So still i dont understand what you say.I dont think you have given all the details in this thread,
On arrival reg was not set
Grips had not been screwed in fully
Paint in barrel
I didnt fire 1 ball at a time "semi-auto" i loaded with my hand one ball at a time into the breach and fired.
The paint was brand new, i suspect it wasnt a barrel break more it was firing the mash it made from blowing back and destroying the balls exiting the hopper.
the chrono was below what it could have been, it was somewhere aroud 240.
Paint in Barrel if there was any which from what i can remember would have been so small
Ok yes sorry my fault one of the screws on the grips wasnt screwed in fully again this will not affect the overall working on the marker.
Blow back as i have mention could be a number of issues Reg being set to high Poppit not sealing correctly. Orings