Hello, YA know. I have been using a Hart since 1990, I have 'upgraded" it with a semi-custom windage adjustable top...I used the top from a Ransom..with quite a bit of customizing machine work done to suit my shooting needs. Also, kind of overkill..I replaced the original elevation screw with a 1" dia. Acme threaded one for greater stability and height adjustment. The body is cast-iron, & with my modifications, this is one very heavy and stable rest. I don't compete in bench-rest either, but do alot of load development, both cast & jacketed.