I agree that plastics have their place but I also look atan all metalsight and think the sight is only as strong as its weakest link. Which would be the fiber optics. Pin gaurds on sights come to mind when I think of platic parts on a sight. This plastic is fairly thick, how much force is it going to take to break that housing. Yet it will take very little force to break a fiber optic and most sights have fiber optics so the weakest link is the same on all sights.