I have a High Standard M4 Contour Barrel, my son has a Delton Sport with a "light" barrel. Both are flattop with front sight towers. Glass is not a problem with the front sights. We bought ours to play/plink. I actually bought mine for duty carry, but have thought about letting my daughter use it for hunting. She loves to shoot it. I know DPMS had some "problems" a while ago, but haven't heard anything recently. I prefer to have back up sights on my rifles, just in case. you can get the Magpul front and rear for an O.R. rifle or just the rear for a regular flattop. There are several manufacturers of fold down sights. Both of the rifles we have are 16" carbines and hold about 1 to 1.5 moa at 100 yards. I hope this helps and you won't regret hunting with the "girl". Loads of fun and great bonding time.
Some Lead, Some Follow, Some Just Need To Get Out Of The Way.