Rugged combat sight for carry handle ar's - Meprolight M21 Day/Night Self-Illuminated Reflex Sights

Very well built combat sight. I was looking for a tough sight to go on my carry handle AR (A2 type) truck gun and this is it. It is non-magnified so its usable range is limited (point blank to 200 yards +/-) but is a nice improvement over iron sights and aging eyes. Clear point of aim that varies with the ambient light, and no batteries to die. I have had other reflex sights to compare this one to and I like this one. The zero was easy to set to co-witness with my irons. The zero adjustment is part of the mount which is probably a wise choice for a combat sight (less to go wrong internally), you can move it slightly with your hands even though solidly mounted but spring pressure pushes it back to where it was set. Not a huge issue and with use I will see how well it holds zero; again combat sight, not precision match sight. I will order the anti-flash kit to upgrade eventually, which should also provide more lens protection. It fits on my carry handle very tightly, not something that is easy to take off and on regularly but there is no reason to if its working. The top handguard can't be taken off with the sight there, if you have a rail or A1 rifle style (triangular, left and right sides mirror image type) this shouldn't be an issue.