Have a look at the Intershoot site in Ireland - and look at Gehmann or Anschutz forend sight systems.
Both have various adjustable systems or inserts etc.
FTP900 +Sightron S111 10-50 x 55
AA Pro Target in FWB FP70 stock + MTC Mamba lite
Daystate Airwolf + Bushnell Elite 6500
" life is about the memories we hold and not the things that we own"