I used to attend the Laguna Mountain Rendezvous and shoot in various matches with various clubs in the primitive class. This class, and the Rendezvous did not allow adjustable sights, but had shots at 50, 100, and 200 yards. I took a tall, period correct rear sight and filed an upside down wedding cake type of notch for the 3 distances aligning the front blade with the bottom of the second notch for 50, the top of the second notch(also the bottom of the first notch) for 100 and the top of the rear sight for 200. I also shoot a Lancaster County rifle, circa 1760, flintlock. It took time , patience, and a lot of slow filing to get it right, but once it is done, it is done.( Besides, primitive rear sights don't cost that much if you do screw up!) I also shot this gun at the Texas State Match about 9 years ago. There is no way to simply hold under and over a target at 50, 100, and 200 yards and hope to win if the other shooters are any good. I do have Bucks County and Berks County caplocks that have primitive looking rear sights that have a blade that can be unlocked with tiny set screws and moved up or down. I am not sure, but I think this is ok for primitive if you don't adjust it during the match as the sight is not really adjustable without first unlocking the little blades. Good shooting!