Had to belt sand one end cause hand guards were too long for my Rock River NM. Then on the inside it had a piece of metal on either side that interfered with the barrel nut. After filling down in 2 spots per guard it installed fine. Had it not been for the fitment issue it would be 5 stars.
Pros: solid once installed
Cons: fitment issues
This review was written in the old system and had content requirements that are different than reviews written today.