Summary Description Semi-Automatic Sporting Rifle SIG-AMT

Summary Description
Semi-Automatic
Sporting Rifle SIG-AMT
cal. 7.62x51 mm (.308 Win.)
Swiss Industrial Company
CH- 8212 Neuhausen Rhine Falls/Switzerland
Phone 053/81555 Telex 76156 sig ch
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Contents
l. Weapon theory
- 3 -
l.l. Designation and purpose
1.2. Main components and
accessories
1.3. Dismantling and assembly
1.4. Cleaning and maintenance
1.5. Functional checks
2. Manipulation
2.1. Loading, reloading, unloading
2.2. Positions of firing, using
normal ammunition
2.3. Sight adjustments
3. Technical data
Page
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6- 7
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13-14
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16
17-18

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l. Weapon theory
1.1. Designation and purpose
The semi-automatic sporting rifle SIG-AMT is a
delayed blow-back weapon with stationary barrel
and semi-rigid breech.
The cartridges are fed from magazines of 5, 10
or 20 rounds.
A considerably reduced recoil and the bipod
which lends the rifle a firm support, improves
accuracy of aim in all types of fire.
Next to the normal trigger, in latched neutral
position, is a winter trigger. This can be unlatched
and shifted into engagement to allow
firing in mittens.
In the head of the breech casing is a loading
indicator, affording a visual check as to whether
the weapon is loaded or unloaded.

1.2. Main components
- 6 -
The principal parts of the weapon are:
- Barrel, bolted firmly to the breech casing.
Breech casing with 2 lock heads, carrying
handle, loading indicator, bolt, rear
sight and cartridge ejector opening.
- Breech with breech head and director shaft,
connected by a transverse key.
- Rear casing with butt and recoil spring column.
Trigger unit with trigger casing, trigger
mechanism, safety catch, winter trigger,
pistol grip with cavity for storing cleaning
materials and magazine charger.
- Barrel casing with bipod, hand rest, and
front sight mount.
Accessories
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- Magazines for 5, 10 or 20 rounds
- Sling
Pull-through with string and wire brush
- Loading indicator holder
- Magazine charger
- Telescopic sight
Control caliber
- Front sight key
- Hand guard (upper half)
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1.4. Cleaning and maintenance
Rough cleaning
Clean down the rifle and magazines externally
and then grease them.
Routine cleaning
Routine dismantling as in Section 1.3.
- Clean down all dismantled components, including
magazines, and grease them.
- Clean the bore. Caution: Lift the loading
indicator and secure it in raised position
with the holder. Check and grease.
- Clean and grease the breech and breech casing
Clean and grease the recoil spring.
- Check over all principal parts.
- Assemble the weapon.
- Perform the functional checks as per Section
1.5.
Complete cleaning
- Detailed dismantling as per Section 1.3.
- Clean, check and grease all components in
the same manner as for routine cleaning .
- Assemble the weapon.
- Perform the functional checks as per Section
1.5.

1.5. Functional checks
a) Safety catch
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- Set safety catch to "S"
- Pull bolt backwards and release
- Check that the trigger remains locked.
b) Firing action
-Set safety catch to "1".
- Squeeze trigger with left hand.
- Draw back the bolt with the right hand,
and allow the breech to glide forward
slowly.
- Check that when the breech is locked,
the hammer is not released.
Release the trigger
-Set safety catch to "S".
c) Pressure point
- Set safety catch to "1"
- Squeeze winter trigger
- Check several times whether the pressure
point can be felt.
d) "Locked breech" gap (similar to head space)
- Turn the weapon, without magazine, to direct
the magazine opening upwards
- Perform vigorous loading action repeate dly
by hand.
- Check the gap on the left hand side between
the breech head and the director
shaft at locked breech position, using
the gauge provided.
2. Manipulation
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2.1. Loading, reloading, unloading
Charging the magazine
a) Without magazine charger:
- Press cartridges singly into the magazine
b) With magazine charger and cartridges in
belt:
- Place magazine charger on the magazine
- Place full clip in the magazine charger,
and press all the cartridges into the magazine
together.

Loading
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- (1) Set safety catch to "S"
- (2) Insert magazine
- (3) Perform loading action (bolt)
Reloading (magazine change)
- {l) Remove empty magazine
- (2) Insert new magazine
- (3) Perform loading action (bolt)
Unloading
- (1) Set safety catch to "S"
- (2) Remove magazine
- {3) Perform loading action
(4) Check that the loading indicator is low
- (5) Set safety catch to "1"
- (6) Squeeze trigger
- (7) Set safety catch to "S"
2.2. Positions of firing, using
normal ammunition
The best accuracy of aim is attained in the
following positions:
- on bipod
Alternative firing positions are:
- prone, without support
- prone with support
kneeling
- sitting
- standing
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2.3. Sight adjustment
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- Only make corrections when the deviation off
aim has been determined definitely.
- Point of aim is corrected by elevation and
lateral adjustment of front sight as follows:
- Slacken the lock screw in the sleeve of the
barrel casing.
- Elevation adjustment (using key) :
- Deviation below target - Turn front sight
to the right
- Deviation above target - Turn front sight
to the left
- Lateral adjustment:
- deviation to the left - Shift front sight
mount to the left
- deviation to the right - Shift front sight
mount to the
right
- Tighten lock nut
again when the
adjustments have
been made
3. Technical Data
Dimensions
Calibre
- 17 -
Overall length of rifle
Barrel length
Rifling pitch
Number of rifling grooves
Weights
Rifle with hand rest cap
Rifle with bipod
Empty steel magazine for
5 rounds
- 10 rounds
- 20 rounds
Sling, complete
Telescopic sight with mount
Ballistic data (average)
Muzzle velocity
Muzzle energy
Shoulder recoil
7,62 x 51 rnrn
(. 308 Win.)
989 rnrn (40")
479 rnrn (19,9")
305 rnrn (12")
4
4330 g
(9 lbs 10 oz)
4520 g
(10 lbs 1 oz)
160 g (5 1/2 oz)
210 g (7 1/2 oz)
300 g (10 1/2 oz)
120 g ( 4 oz)
630 g
(1 lb 6 1/2 oz)
790 m/sec
(2600 ft/sec)
300 m/kg
( 217 o f t I lb )
0,85 m/kg
(5 ft/lb)

Sights
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Sight base
(rear sight - front sight)
Rear sight (aperture type)
- with range adjustment
- graduated for every
Front sight lateral adjustment
Front sight elevation adjustment
Telescopic sight:
- Magnification
- Scope diameter
- Visible field at 100 m
- Lateral adjustment
- Elevation adjustment
540 mm (21")
100-600 m
(109-650 yd)
100 m
(109 yd)
+ 2 o/oo
-
+ 2 o/oo
4 X
25 mm (1")
12 m ( 13 yd)
+ 14 o/oo
+ 23 o/oo