M4A1 Boresighting and Zeroing: Understanding the Geometry
Understand sight height, line of sight, bore axis, trajectory, and why prescribed short-distance offsets can put an M4A1 on target before live-fire confirmation.
#whatsaborelight?
The M4A1 Zeroing Process: A Practical Coaching Guide
A practical overview of M4A1 zeroing: establish mechanical settings, boresight where authorized, fire consistent groups, adjust from group center, and confirm at distance.