The Small Arms Collimator (SAC) is a precision optical device that allows military or law enforcement shooters to confirm zero and/or re-zero weapons, to a high level of accuracy, without live fire.

…..
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.
Go to Why Use the SAC article.
Go to SAC Grid and Reference Points article.
Go to Using the SAC for Training/ BRM article.
Go to Using the SAC in the Operational Environment article.
Go to Collimator vs. Laser Boresight article.
Go to the SAC product page.
Go to the SPA Defense SAC product page for GSA sales.
USAF Fields the SAC
SAC Available on GSA
The Small Arms Collimator
Why Use the SAC?
SAC Grid and Reference Points
Using the SAC for Training/ BRM
Using the SAC in the Operational Environment
The Critical Importance of Accuracy in a Zero Confirmation Device
Collimator vs. Laser Boresight