Small Arms Summary Questions

Question 1

The contour of the cart case depends on
what factors?

Answer 1

Role of the cartridge.
Type of weapon in which it is to be used.
Projectile design.
Ignition system used.

Question 2

State the 4 main components of SAA:

Answer 2

Cart case.
Projectile.
Primer.
Propellant.

Question 3

There are 4 main types of cartridge case
bases what are they:

Answer 3

Rimmed.
Rimless.
Semi rimless.
Belted rimless.

Question 4

State the 3 types of ignition systems (primers):

Answer 4

Integral Anvil –(BERDAN)
Separate Anvil –(BOXER)
Rimfire.

Question 5

What are the 4 base markings found on SAA:

Answer 5

Manufactures symbol.
Year of manufacture.
Calibre.
Model number.

Question 6

What are the two grades of 12.7mm MP NM140 and what are they used in?

Answer 6

Grade A. (Loose)
Grade B. (Link)

Used in:
0.50 Cal M2 HB/QCB machine gun.
AI AW 50F rifle.
M82A1M AMR.

Question 7

What are the multiple target effects of the MP
NM 140?

Answer 7

Penetration.
Fragmentation.
Incendiary.
Blast.

Question 8

How many fragments behind the target plate
must the 12.7 MP NM 140 projectile produce?

Answer 8

10

Question 9

What is the authorised weapon system for the following natures:
MP NM140
MP-T NM160
AP-S NM173

Answer 9

0.50 Cal M2 HB/QCB machine gun.

Question 10

What do the following abbreviations mean?

MP
MP-T
AP-S
SLAP-T

Answer 10

MP:
Multi Purpose.

MP T:
Multi Purpose Tracer.

AP S:
Armour Piercing Super.

SLAP-T
Sabot Light Armour Piercing Tracer

Question 11

What are the penetration requirements of the
AP S NM173 projectile?

Answer 11

22mm thick armour plate (321 375 hardness).

Question 12

In your own words explain the functioning of
centre fired rounds?

Answer 12

On firing, pin strikes boxer type primer, crushes anvil against priming mixture in primer. Ignites composition and flashes through case hole into cart case. Propellant is ignited, resultant burning produces hot expanding gases which act on the base of projectile to drive forward through barrel, acting on case mouth forcing it outwards against breech to form a gas seal.

Question 13

In your own words, explain the functioning of
12.7mm MP ammunition?

Answer 13

On impact the nose of each projectile is compressed and incendiary ignited. As the projectile passes through the target, pressure continues to build up within the nose
and the incendiary composition ignites the high explosive. Deflagration turns to detonation, producing blast and frag. The second incendiary charge then ignites and burns for approx. 1 second.