Cannot stand the factory rings. Aluminum screws strip very easily. I'm familiar with Warne and Leupold Tikka mounts. They work fine. Warne rings fasten like the factory rings, only they are all steel and have Torx head instead of Allan. Leupold may make others but the one I'm familiar with uses a base and Std. Rings.
Championship Breeder: Belgian Airheads and Appalachian Pisshounds
Denton Chapter President - Peter Tork Fan Club