I noticed that the DPMS patterned upper receiver has a different height rail from the standard AR. It appears to be about 0.060" higher from the barrel centerline, maybe more.

The barrel I have is a 20" rifle length gas system barrel with a standard front sight ( non F marked).

Based on this, how do I select a rear sight? It would seem that a standard rear sight would require a taller front sight post.

Any input is appreciated.