What is the primary purpose of establishing a carbine zero at a known distance?

What is the primary purpose of establishing a carbine zero at a known distance?

• A. To calibrate the optic's magnification.
• B. To select a ballistic coefficient.
• C. To align sights with the expected impact at a specified distance.
• D. To adjust the bayonet lug alignment.

Answer: (C)

Zeroing a carbine at a known distance fixes the aiming reference to the bullet’s actual path at that range. By shooting at that distance and adjusting the sights or optic, you make the point of aim align with the point of impact, so the reticle and the bullet’s trajectory coincide where you expect it to. This creates a reliable baseline: once your sights are zeroed, you can predict how the bullet will behave at other ranges and use holds or dope with confidence. The other ideas aren’t the purpose of zeroing: magnification calibration, ballistic coefficient selection, and bayonet lug alignment don’t determine the alignment between the aim point and actual impact.

Zeroing a carbine at a known distance fixes the aiming reference to the bullet’s actual path at that range. By shooting at that distance and adjusting the sights or optic, you make the point of aim align with the point of impact, so the reticle and the bullet’s trajectory coincide where you expect it to. This creates a reliable baseline: once your sights are zeroed, you can predict how the bullet will behave at other ranges and use holds or dope with confidence. The other ideas aren’t the purpose of zeroing: magnification calibration, ballistic coefficient selection, and bayonet lug alignment don’t determine the alignment between the aim point and actual impact.