Had a 3D butt hook via Brian Sansom fitted on my FTP900. A fantastic hook and felt so comfortable, so when I bought a Steyr I though about the butt hook. So I bought another hook carrier from Brian and ten minutes fitted to the Steyr butt plate. So now without altering the 3D hook I just slide it out of the carrier on FTP and slide into the Steyr carrier. Thanks Brian Jeremy.