My Huntsman barrel came with a sturdy Williams Firesight set, made of aluminum. I find it to be entirely satisfactory. By swapping out just a few parts, I was able to make the Guide Open Sight base into a receiver sight. The mounting holes don't match up, so the base is attached to the chamber end of the barrel by one screw only, but the open sight base accepted the aperture windage and elevation slides from another Williams sight in my parts box with no trouble.