I don't own a Treehawk, but do have White Mountain Carbines. On the WMC the front sight is in a dovetail, and can be tapped out, with a brass drift and hammer. (I have changed sights on mine). If you are shooting high, you need a taller front sight. Check with Williams Sights, customer service, as I have gotten sights from them in the past, and they carry a good selection.