Charlie Caller just very kindly fitted a Tinbum drop-in kit into my Pro Sport and with a good fettle, lube and polish internally, he has transformed the rifle into a smoother cocking, smoother shooting, precision-hunting powerhouse with PCP-level precision accuracy at 11.5+ with JSB Heavies 5.52mm.
It has to be, now, one of the very best Pro Sports out there and the whole kit cost all of £25 quid.
So how good must these tuning jobs costing over £100 to £200 must be? For that money I would want nothing less than precision accuracy and smooth-as-silk cocking and firing .
Did you add the short stroke extension by any chance. I have read of issues with it because the the cocking action on the pro sport. Looking to fit the standard drop in but dubious about the SSE...thanks