The hardest part was getting the old front sight off. Go to U-Tube for several videos showing how to do this. I installed new Star 556 pistol rail on my SIG 556 patrol at the same time. They look great together. I own several YHM and Troy BUIS and this onr is built to the same quality.
Pros: Easy Installation and Matches Samson S556 Rails
Cons: The rear sight is a bit high when folded and may interfere with optical sight
This review was written in the old system and had content requirements that are different than reviews written today.