Air Arms Regs
I bought an AA Pro Target and this had reg creep problem. I had heard of these regs being described as boomerang regs as the problems keep coming back, so took my gun to Shaun Hill who makes the ISP Airstream rifles. He fitted his own reg (much smaller than the AA one) and now this rifle behaves perfectly, suffering operator errors only.
While he was fixing this I decided I needed a spare so bought an EV2 which was fully checked out for reg performance and creep. This shot well for a few weeks and then I noticed that I had the same problem as the Pro target.
Shaun has just fitted his reg in this rifle also and I hope to pick it up from him tomorrow.
Anything Shaun does with air rifles impresses me. I owned one of his Mk 1 Airstreams and it shot brilliantly.
Shaun charges £150 for his regs and he is based near Walsall West Midlands
Hope this helps mate