Bright RED surplus tracers for your AR. Head stamped either GFL for the Fiocchi Ammunition Company or FC for Federal Cartridge Company. New manufacture.
These are .223 which is not the same as 5.56mm. Firing .223 ammo in a 5.56mm chamber can result in different pressures than you would get with 5.56mm ammo. For more information on this issue please check the Internet.
These tracers ignite at ~75 -100 yards so that you might not see them at closer ranges. Be aware that if you don't see 100% ignition and you are shooting at 75 yards, it isn't the ammo!
Clean ammo, repackaged 20 or 50 to a box.