Windham Weaponry 20" Government Iron Sight Revisit, 23JAN2020

Incorrectly installed a .040" taller front sight post not realizing Windham Weaponry uses what is called a Commercial-Spec carry handle. I thought the carry handle was Mil-Spec. Windham uses a standard A2 front sight base instead of an "F" marked. Don't know why Windham just doesn't use the correct "F" marked front sight base and use a Mil-Spec carry handle?