Steyr took care of getting me replacement recoil spring/guide rods a few months back. i sent them an email describing how i've spent several months getting the run around from GSI, CDNN, Dynamit Nobel, and expected that the warranty would be honored by some entity.
they also directed me to Odell Engineering in Canada for spare parts.
what kind of warranty work are you needing to have done, if you dont mind my asking?