I own a Kowa TSN 82SV with a 20-60 Zoom eye piece. I happen to be reading about the old M49 Spotting scope. I would like to know the pros and cons between both. I can buy the M49 for much less and can sell my Kowa and get other items I need for my AR15. I will be using it mainly on the Rifle range max 600 yds. Thank you