Here ya go, Chuck. Bear in mind that I am comparing 12 and 20 ga splinter forends against a 28 ga beavertail. Both the 12 and 20 ga splinter forends' metal measured the same: 0.75" thick at the rear screw, by 0.60" thick at the front screw. The beavertail was also 0.75" thick at the rear screw, however it was 0.8" thick at the front screw, and the wood carries this extra thickness to the end. You can see in the first pic that the BT metal has a raised section around the front screw. In the second pic I tried to show them side by side (
) in the same picture so you could see the extra height at the end of the BT. I hope these help you.
Joe