I just removed some sako 2 piece optilok mounts from a Sako brown bear in 375 H&H that I bought. They held the scope up way too high off of the receiver. I believe I could have gotten some lower rings and switched them out to help a little bit, but instead I chose to use the Leupold 2 piece quick detach low rings with bases. The brown bear comes with excellent iron sights, and I wanted the option to use them if needed in certain hunting situations. The leupold sako quick detach bases are very similar to the sako optilok bases and "clamp" on to the tapered dovetail of the sako receiver via a torx screw/clamp. The quick detach low rings come on and off with the flip of a small lever on the side of the bases. I have read many good reviews with this leupold combination, but have not made it to the range yet. I just acquired this rifle last week. Btw, if anyone is interested in the two piece sako optilok rings and bases, let me know. They are in perfect shape and I would sell for a reasonable price.