Fellow Sako Owners, I have a question regarding a L61R stamp on my AV barrel that appears to be "GO" before the serial number the caliber is a .280 with a 24" barrel. I purchased the rifle about 1991. Its my reliable rifle that I wanted to follow in my fathers footsteps and it has been nothing but beyond what I expected. Any information on the barrel stamp would be helpful and much appreciated. HBHUNTER.