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USAF Fields the SAC

U.S. Air Force Security Forces around the world have begun receiving small arms collimators for their M4 and M16 rifles.

SAC Available on GSA

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SPA Defense will be assisting us in introducing the small arms collimator (SAC) to military and law enforcement organizations within the United States. They are our exclusive GSA outlet.

Content Articles

Photo courtesy of US Army
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The small arms collimator (SAC) is a very precise, advanced optical device that allows shooters to check zero and/ or re-zero weapons in just a few seconds in any environment— without live fire. By ensuring that weapon, sight system, and shooter are always properly tuned to each other (properly zeroed) the SAC helps maximize the capabilities of each. It can also be used to speed up the initial zero process, as a training aid when teaching marksmanship fundamentals, and to help quickly diagnose problems with weapons, sights, or mounts.

Why Use the SAC?

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In combat, the difference between an enemy that is down and out of the fight versus one who is able to continue to send rounds in your direction is often measured in inches. For this reason, we should constantly strive to improve combat marksmanship. The SAC is a very powerful tool for this purpose.

SAC Grid and Reference Points

The SAC provides two types of reference points: Correct Zero Position (CZP) and Personal Zero Position (PZP). Understanding these reference points is important to understanding what the SAC is and how it differs from boresights.

Using the SAC for Training/ BRM

Photo courtesy of US Army
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In the Training/ Basic Rifle Marksmanship (BRM) environment, the small arms collimator can be used to reduce ammunition costs and range time associated with initial zeroing. It has also been shown to improve marksmanship scores. Additionally, frequent use of the SAC emphasizes the importance of maintaining a good zero on weapons at all times and develops the knowledge and mindset needed to use the SAC in operational units.

Using the SAC in the Operational Environment

Photo courtesy of US Army
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The Small Arms Collimator (SAC) is a very powerful tool for maintaining combat readiness at the individual and small unit level. Used properly, it helps to maximize the benefits (i.e. engagement speed and accuracy) provided by our weapon platforms and various sight options.

The Critical Importance of Accuracy in a Zero Confirmation Device

Boresight devices, which are inherently inaccurate, are considered by some to be ‘good enough’ for zero confirmation in the field. The logic, which makes perfect sense on the surface, is that a given weapon platform does not require a zero confirmation device that is accurate beyond that platform’s capabilities. Using this logic the M4, as an example, which is commonly considered to be accurate to about 4 minutes of angle (MOA), would only need a 4 MOA capable device to check zero. If we consider this logic more carefully, though, its fallacy is quickly exposed. Adjusting zero based on an inaccurate boresight device degrades the overall accuracy of the weapon system.

Collimator vs. Laser Boresight

Photo courtesy of US Army
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Verifying zero on rifles prior to combat is essential, particularly after changing sights or bouncing a weapon around during infil/ movement. Since live-fire checks often aren’t possible, a few alternatives are being explored by the US military. One option is a laser boresight device of some type. The other is the Pyser-SGI Small Arms Collimator (SAC).

While some laser boresights can be a useful tool during the initial mounting of optics, all of them fall well short of the levels of accuracy and repeatability required for zeroing a combat weapon. They also use batteries, emit a visible signature, and need a downrange target.

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Small Arms Collimator (SAC)