I'm not crazy about the Sako slide-on Opti-lok system but I'd forgotten about the good ol Ruger system that I do like, it seems to be very secure and it is machined into the receiver with a recoil lug, at least you can get your scope low enough and the system is light and clean looking (not bulky at all) Hell, Ruger even includes rings, it's really a pretty good deal..The Weaver system I also like, a vast array of ring choices that are solid as a rock with a nice big recoil lug.................547.