The standard front/rear covers (122XX) are for Comp sights & 9000 sights. The 12462 Front Cover is a Front Flip-up lens cover and integrated Killflash for all Aimpoint CompML2, CompM2, CompML3, CompM3 Sights. The killflash will also flip up (in the same direction as the lens cap) if needed.
Aimpoint Flip Up Lens Cover - Front or Rear
WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov