Tonight I finished up a new upper with a KAC URX 3.1 8" hand guard. The last step was to install the bottom cover of the hand guard, but it would not go on. It looks to me like my Daniel Defense clamp on gas block is slightly interfering, but it is hard to tell. If it is it is very slight on the bottom corners.

This seems like it should be a common combination. Has anybody else had this issue?