NRA NRA Sight Systems & Optics

Question 1

What term describes the proper relationship between the front sight post and the rear sight notch when they are correctly aligned for aiming?

Accepted Answer

Sight alignment

Answer

Sight alignment refers to the correct positioning of the front sight within the rear sight notch, which is a prerequisite for accurate shooting.

Question 2

Which type of iron sight uses a circular rear aperture through which the shooter looks to align with the front sight?

Accepted Answer

Peep (aperture) sight

Answer

A peep or aperture sight uses a circular hole as the rear sight element; the eye naturally centers the front sight in the aperture for consistent alignment.

Question 3

What is 'sight radius' on a firearm?

Accepted Answer

The distance between the front and rear sights

Answer

Sight radius is the measured distance between the front and rear sights; a longer radius reduces angular aiming error and generally improves practical accuracy.

Question 4

Which sight technology gathers and concentrates ambient light through an optical polymer rod to produce a bright aiming dot?

Accepted Answer

Fiber optic sight

Answer

Fiber optic sights use a polymer optical fiber to collect surrounding light and concentrate it at the tip, creating a bright, high-visibility aiming point in daylight conditions.

Question 5

In the context of firearm sights and ballistics, what does the abbreviation 'MOA' stand for?

Accepted Answer

Minute of Angle

Answer

MOA stands for Minute of Angle, an angular unit approximately equal to 1.047 inches at 100 yards, universally used to express sight adjustments and group sizes.

(NRA) National Rifle Association Certified Gunsmith Practice Test

(NRA) National Rifle Association Certified Gunsmith Practice Test

NRA NRA Sight Systems & Optics