Fits Thompson Center Encore and Pro Hunter muzzle loader barrels to raise or lower point of impact (POI) from your existing front sight. This sight is .345" high. Measure your existing front sight. If it is higher than .345", this front sight will raise your POI. If your existing sight is lower, this sight will lower your point of impact. We also have this sight in a higher .470" version if you need something higher... Click .470 Sight. Fitted with Tru-Glo„¢ fiber optics this front sight provides a highly visible dot that appears to emit a radiant glow in low light conditions - providing a distinct aiming point for accurate shooting. It's especially effective with our PeepRib„¢ and WGRS peep sights. For more TC Accessories, see our Thompson Center Arms Home Page.