The SAC provides two types of reference points, which we refer to as Correct Zero Position (CZP) and Personal Zero Position (PZP). Understanding each of those reference points and how they work is critical to using the collimator effectively.
The SAC spigot is engineered and manufactured very precisely in order to make it rigid and durable AND to protect the barrel. However, shooters should still be careful when inserting the spigot in order to prevent damage to the SAC or the weapon.
Correct Zero Position, or CZP, is located at coordinates 'I, 9' on the collimator grid. It is primarily used to get shooters close or ‘on paper’ prior to live fire zero. CZP can also be used as an emergency zero for shooters who do not have a recorded PZP.
Establishing and recording a Personal Zero Position (PZP) allows shooters to quickly and accurately confirm zero in any environment. PZPs can be recorded for different distances, types of ammo, elevations, sights, etc.
Once PZP has been established and recorded, shooters can quickly and accurately confirm zero any time- as part of pre-combat checks, at the beginning of each shift, etc. This ensures that shooters always go into the fight with a properly zeroed rifle.
The collimator is designed to be used in all light conditions. To use it during low light conditions, or with an image intensified night vision sight, an included LED Illumination Module is used to backlight the collimator grid.
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