Results

Jonathon Fox
Assessment Statistics
88%
88 out of 100 points
88
Out of 100 points
Time for this attempt: 1 hour 22 minutes 12 seconds
1 hour 22 minutes 12 seconds01:22:12
Time for this attempt
Your Answers:
Results for question 1.
1
2 / 2 points
"MIL-SPEC", which is short for "military specification", is the lowest
allowable standard for something to be accepted into the military.
Correct answer:
True
False
Results for question 2.
2
2 / 2 points
Click on the hammer spring.
Selected Answer - Correct
Correct Answer
Results for question 3.
3
4 / 4 points
Flash hiders do their job by creating ________________ and disrupting
the bubble of hot gases.
jets of gas
, Not Selected
photons
, Not Selected
Correct answer:
turbulence
surface tension
, Not Selected
Results for question 4.
4
0 / 2 points
The problem with the AR platform, as it relates to gunsmithing, is
that few manufacturers still make the small components used in its
construction. This would include items like the forward assist, dust
cover, and trigger. This creates a powerful bottleneck, especially
when supply issues occur, as seen during the COVID-19 pandemic.
Incorrect answer:
True
Correct Answer:False
False

Feedback

Based on answering incorrectly

This answer is false, and the student will not find language in the
lecture to corroborate this statement, however, this is spoken of in
chapter one, page six of "Gunsmithing the AR-15: The Bench
Manual" .
Results for question 5.
5
4 / 4 points
Which of Newton's laws of motion are used in the proper design of
muzzle brakes?
Fourth law
, Not Selected
Second law
, Not Selected
First law
, Not Selected
Correct answer:
Third law
Results for question 6.
6
2 / 2 points
Click on the magazine release button.
Selected Answer - Correct
Correct Answer
Results for question 7.
7
2 / 2 points
Click on the pivot pin.
Selected Answer - Correct
Correct Answer
Results for question 8.
8
2 / 2 points
Click on the disconnector.
Selected Answer - Correct
Correct Answer
Results for question 9.
9
0 / 4 points
Muzzle brakes and compensators are the same thing.
True
Incorrect answer:
False
Correct Answer:True

Feedback

Based on answering incorrectly

The answer can be found on page 197 of “Gunsmithing the AR-15: The Bench
Manual”.
Results for question 10.
10
4 / 4 points
The gas rings on an AR bolt should be oiled.
Correct answer:
True
False
Results for question 11.
11
2 / 2 points
The cons of a piston-driven AR system might include the following
(select all that apply):
Correct answer:
Increased weight
Answer,
Decreased cyclic rate
Answer,
Decreased adjustability
Answer,
Increased fouling
Results for question 12.
12
2 / 2 points
In the AR9, or in ARs that have been converted to chamber the 9mm
and .22LR cartridges, the gas system required for the AR-15 is no
longer needed, however, other adjustments to certain components
will need to be made.
Correct answer:
True
False
Results for question 13.
13
2 / 2 points
The bolt catch:
Correct answer:
holds the bolt in the open position.
retains the hammer when the bolt moves to the rear.
, Not Selected
ensures that the locking lugs of the bolt fully engage with the
locking lugs of the barrel extension.
, Not Selected
locks the bolt in the forward position.
, Not Selected
Results for question 14.
14
2 / 2 points
What type of energy is utilized in a straight blowback design to
move the bolt to the rear?
Magnetic energy
, Not Selected
Potential energy
, Not Selected
Correct answer:
Recoil energy
Electrical energy
, Not Selected
Results for question 15.
15
4 / 4 points
The extent to which you clean a firearm depends on what that
firearm was used for and for how long it was used.
Correct answer:
True
False
Results for question 16.
16
4 / 4 points
What is the purpose of cleaning the BCG?
To reduce recoil
, Not Selected
To prevent rust buildup
, Not Selected
To improve accuracy
, Not Selected
Correct answer:
To prevent carbon buildup
Results for question 17.
17
2 / 2 points
What is the range for a dimension of .3255" +/- .0005" in
gunsmithing?
.325 in. to .330 in.
, Not Selected
Correct answer:
.325 in. to .326 in.
.326 in. to .331 in.
, Not Selected
.320 in. to .325 in.
, Not Selected
Results for question 18.
18
2 / 2 points
Generally, the selector is installed in the lower receiver prior to the
trigger.
True
Correct answer:
False
Results for question 19.
19
0 / 2 points
Which of the following statements is true about the impact of tight
tolerances on firearms?
Incorrect answer:
Firearms with tight tolerances are not impacted by "tolerance
variability" during the manufacturing process.
Correct Answer:
Tight tolerances can make a firearm more accurate.
Firearms with tight tolerances are less susceptible to malfunctions
caused by debris.
, Not Selected
Tight tolerances can make a firearm more accurate.
, Not Selected
Tight tolerances can make it easier to produce components.
, Not Selected

Feedback

Based on answering incorrectly

The answer can be found in the week two lecture "Understanding

Timing" under "What is Timing and Why is it Important to
Understand?"
Results for question 20.
20
2 / 2 points
True or False: The piston system in the standard AR platform is
becoming less popular due to its increased complexity in
components.
True
Correct answer:
False
Results for question 21.
21
2 / 2 points
The 5.56 NATO chamber has a longer
Correct answer:
leade
than a .223 Remington chamber to allow for the increased
pressures in the 5.56 NATO cartridge.
Results for question 22.
22
2 / 2 points
The reason there are few "forge shops" that handle the AR market is
because:
"forge shops" generally did not have the tooling required to forge
the uppers and lowers.
, Not Selected
Correct answer:
other "forge shops" found that the AR work was a marginal part of
their business and their time and resources were better spent
elsewhere.
"forge shops" by and large did not want to deal with the political
repercussions of manufacturing these parts.
, Not Selected
"forge shops" experienced widespread layoffs during the 1980s and
it has been difficult for them to recuperate from this.
, Not Selected
Results for question 23.
23
2 / 2 points
When installing the pistol
Correct answer:
grip
screw, it can be easy to cross-thread it if it's not properly guided
into the threads.
Results for question 24.
24
2 / 2 points
In general, the M4 differs from the M16 in that the M4 has:
Correct answer:
A shorter barrel.
A better muzzle device.
, Not Selected
A different magazine mounting bracket.
, Not Selected
A different bolt design.
, Not Selected
Results for question 25.
25
2 / 2 points
A piston-driven AR does not get hot.
True
Correct answer:
False
Results for question 26.
26
4 / 4 points
To keep an AR running properly, a heavier gun grease will be
needed.
True
Correct answer:
False
Results for question 27.
27
2 / 2 points
The projectile of the .22LR cartridge fits a barrel with a nominal
_________________-inch diameter bore, while the .223/5.56 is
designed for a bore with the nominal diameter of .224.
.220
, Not Selected
.223
, Not Selected
Correct answer:
.221
.222
, Not Selected
Results for question 28.
28
0 / 4 points
One con to direct thread muzzle devices is that they can...
become expanded after extended shooting.
, Not Selected
Incorrect answer:
become tight over time.
Correct Answer:
become loose over time.
become loose over time.
, Not Selected
become entangled with vegetation.
, Not Selected

Feedback

Based on answering incorrectly

The answer can be found on page 200 of “Gunsmithing the AR-15: The Bench
Manual”.
Results for question 29.
29
4 / 4 points
Muzzle brakes and flash hiders are the same thing.
True
Correct answer:
False
Results for question 30.
30
2 / 2 points
What is the decimal equivalent of the fraction 1/16?
.016 in.
, Not Selected
.16 in.
, Not Selected
Correct answer:
.0625 in.
.625 in.
, Not Selected
Results for question 31.
31
2 / 2 points
True or False: The timing of components within a firearm is critically
affected by the tolerance or space between the components.
Correct answer:
True
False
Results for question 32.
32
2 / 2 points
According to the reading material this week (i.e. gas port location and not
ATF regulation), rifle length barrels are
Correct answer:
20
inches long.
Results for question 33.
33
2 / 2 points
What is the term used in gunsmithing to describe a measurement
that is within the ten-thousandths place value?
Variance allowance
, Not Selected
Loose tolerance
, Not Selected
Correct answer:
Zero tolerance
Tight tolerance
, Not Selected
Results for question 34.
34
2 / 2 points
According to this week's lecture material, what is the thickness of a
strand of fur on a German shorthaired pointer in thousandths of an
inch?
.0025 in.
, Not Selected
.0085 in.
, Not Selected
.004 in.
, Not Selected
Correct answer:
.001 in.
Results for question 35.
35
2 / 2 points
What is the slang term often used by gunsmiths when referring to
the measurement of "thousandths of an inch?"
Correct answer:
Thou
Hundred-thousandths
, Not Selected
Ten-thousandths
, Not Selected
Inch-fractions
, Not Selected
Results for question 36.
36
2 / 2 points
The flange on the firing pin of a semi-automatic only firing pin
measures at:
.340"
, Not Selected
.334"
, Not Selected
.370"
, Not Selected
Correct answer:
.330"
Results for question 37.
37
4 / 4 points
If you need to scrape carbon buildup off of your AR components, you
are not cleaning your firearm enough.
True
Correct answer:
False
Results for question 38.
38
2 / 2 points
What are the eight steps in the cycle of operations?
Loading, firing, unloading, cleaning, cocking, extracting, ejecting,
feeding
, Not Selected
Inserting, locking, extracting, firing, unloading, ejecting, cocking,
feeding
, Not Selected
Loading, unloading, firing, cocking, locking, extracting, ejecting,
feeding
, Not Selected
Correct answer:
Feeding, chambering, locking, firing, unlocking, extracting, ejecting,
cocking
Results for question 39.
39
2 / 2 points
The problem with the AR (AR-15, AR-10, and AR9) platform is that all
of the components, no matter how small they are, are purpose-built
and you cannot source them from anywhere else, other than from
an authorized dealer.
True
Correct answer:
False
Results for question 40.
40
2 / 2 points
If you have to put body weight into torquing the barrel nut on an AR-
style firearm, you have likely exceeded the
Correct answer:
80
ft. lbs. limit