This high quality optic from lancer tactical won't let you down. The casing is made fully made of metal and very solid. The built in weaver/picatinny base allows you to easily mount this green dot sight on any AEG that has 20mm rail. This scope is perfect for M4/AR15 variants because it is elevated just enough to clear a standard CQB style sight. The fiber optic wire give the scope a crystal clear image of your target, and the bright green dot helps you easily and quickly acquire your target. If you're looking for a new optic for your AEG you can't go wrong with this scope.