Charles,

THe Smithson mounts require that your double square bridge receiver be specially machined for them. When building a rifle on the GMA action, the Smithson mounts add $600 to the cost compared to no mounts, but are on par with machining the receiver to accept Talleys, and cost less than claw mounts.

Buzz will be at Dallas with his video and hunts still available (when I left he had a hunt for 5 cow ele and a sable/PG hunt still available).