If you're thinking that the KeyMod Rail system is made specifically for the AR platform, you might want to rethink that since various manufacturers are now adopting it for various platforms. Midwest Industries actaully released their MI Tavor KeyMod Handguard for the TAR-21 though we don't know if you need to do some modification if you want to fit it to your TAR-21 AEG. You can also get optional light mount cap so you can install a taclight up front.