To be honest now that I've seen the picture, I would just take a file to it. Roger5

Just wondering, it's not a pellet tray is it, Rowan normally supply one with .177 mag kit, I had one that moved once until I stuck it down with some glue, just a thought. Roger5

I had a tac 30 and used sportsmatch mediums on my ultimate, but I didn't use side wheel, have a look at bkl 30mm lows sounds daft but they are a bit higher than sportsmatch meds and they are fine and the saddle clears the magazine.

Crack the bolt on the gauge mount, you might need a new seal afterwards