Sweet Old Bill:love my firebird by checkmate bows with 2 sets of limbs 1 is 40 lb and 2nd is 50 lbs at 28 inch draw..
Years ago I bought my wife one of those., It was the first belly mount bow we had. I liked it so much I decided to try building them and hense the Talon , Talon 11, and Storm Eagle. I was especially impressed with Marks tapers which were thinner in the sweet spot and thicker on the ends. He is quite a bowyer and has probably built more bows than any one man alive. His production and quality for the amount of bows is an icredible feat IMHO.
God bless you all, Steve