The SAC utilizes an alpha-numeric grid that is fixed in a very precise, consistent position relative to the bore of the weapon. For the M4/ M16, the grid is graduated in large, bold squares and smaller, finer squares. The large squares are 4 mils (equal to approximately 14.4 inches at 100 yards) and the small squares are 2 mils (approximately 7.2 inches at 100 yards). The SAC provides two types of reference points, CZP and PZP...
1. CZP -Correct Zero Position
CZP is located at coordinates ‘I,9’ on the SAC grid (at the point of the inverted triangle). CZP is zero for the average shooter on the specified weapon platform, with a specified ammunition type, at the specified range. Adjusting weapons to CZP will almost always get shooters on paper- and very close to zero- before ever firing a shot (shooters are typically within about 2 inches of zero on a 25m target). Note that, while it is possible to have an instructor or armorer adjust weapons to CZP in order to get shooters on paper, it is best to allow the shooter to complete the process. This ensures that the shooters’ individual characteristics (i.e. height, length of pull, eye relief, etc) are properly accounted for. Results will be much better if CZP is established by the actual shooter.
Each SAC has a user specified range and ammunition type that determine relative location of CZP on the grid. This affects only establishing CZP prior to initial zeroing. Adjustments can be made by the shooter to accommodate different zero ranges. The shooter simply moves point of aim slightly higher or lower on the SAC grid.
Collimator CZP provides an incremental- but significant- improvement over the capability offered by existing products. Like a high-end boresight, the SAC can be used to get weapons ‘on paper’, but it is much faster and simpler to use than most other devices in this capacity. The speed and ease-of-use advantage makes soldiers much more likely to use the SAC- and saves more valuable training time. While extremely useful, though, CZP is only a secondary or ancillary capability of the SAC. Personal Zero Position (PZP), the primary type of reference point, provides a capability that no other product is able to deliver.
2. PZP- Personal Zero Position
PZP is identified by noting point of aim (POA) on the SAC grid after zero has been established and confirmed using standard live fire procedures. Once PZP has been recorded, the shooter is able to quickly confirm zero and, when necessary, re-zero a weapon by simply adjusting POA to the recorded position. This is as accurate and dependable as conducting live fire confirmation (we still recommend live fire confirmation any time it is possible).
Different PZPs can be recorded for different ranges, sights, types of ammo, altitudes, etc., enabling soldiers to build a ‘data book’ with PZP settings for a variety of sights, ranges, and conditions.