Question: what is the difference between trijicon hd and hd xr?
Answer: Similar to the original metal-bodied HD sights, the new HD XR incorporates a thinner front post to allow for daylight on either side when sighted through the U-notch rear unit. ... The new HD XR night sight (top) has a thinner front post than the original HD (bottom). Note the yellow and orange front ring color options.