- 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 - 3 - Contents l. Weapon theory Page l.l. Designation and purpose 5 1.2. Main components and accessories 6- 7 1.3. Dismantling and assembly 9 1.4. Cleaning and maintenance ll 1.5. Functional checks 12 2. Manipulation 2.1. Loading, reloading, unloading 13-14 2.2. Positions of firing, using normal ammunition 14 2.3. Sight adjustments 16 3. Technical data 17-18 - 4 - - 5 - 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 un­ latched 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 whe­ ther the weapon is loaded or unloaded. - 6 - - 7 - 1.2. Main components Accessories The principal parts of the weapon are: - Magazines for 5, 10 or 20 rounds - Barrel, bolted firmly to the breech casing. - Sling Pull-through with string and wire brush Breech casing with 2 lock heads, carrying - Loading indicator holder handle, loading indicator, bolt, rear sight and cartridge ejector opening. - Magazine charger - Telescopic sight - Breech with breech head and director shaft, Control caliber connected by a transverse key. - Front sight key - Rear casing with butt and recoil spring co­ - Hand guard (upper half) lumn. Trigger unit with trigger casing, trigger mechanism, safety catch, winter trigger, pistol grip with cavity for storing cleaning ; I materials and magazine charger. - Barrel casing with bipod, hand rest, and front sight mount. J - 8 - - 9 - 1.3. Dismantling and assembling Routine dismantling . - (1) Unload weapon as per Section 2.1. - ( 2) Remove butt - ( 3) Draw and remove bolt - (4) Extract breech - ( 5) Remove trigger casing (squeeze retai­ ning pin with thumb and forefinger, and slide to the right) . - ( 6) Separate the breech head from the direc­ tor shaft by removing the transverse key f - ( 7) Remove the recoil spring column from the 'I butt. Detailed dismantling - ( 1) Routine dismantling (1-7) ( 8) Detach the sling by unhooking the spring hook from the front sling bracket. - (9) Remove upper part of handrest ~ -(10) Unscrew the hand rest screw, and remove the hand rest - ( 11) Unscrew and remove the screw from the connector piece of the barrel casing -(12) Slide the barrel casing forward off the barrel - ( 13) Dismantle the magazine -(14) Unscrew the butt screw -(15) Remove the butt, together with the end plate and the rear sling bracket, from the rear casing Assembly Reverse the above operational sequence. - 10 - - 11 - 1.4. Cleaning and maintenance r 0 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, in­ cluding 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 ca­ sing Clean and grease the recoil spring. rvvvvvv 1 - Check over all principal parts. - Assemble the weapon. - Perform the functional checks as per Sec- tion 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 Sec- tion 1.5. - 12 - - 13 - 1.5. Functional checks a) Safety catch - 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 2. Manipulation point can be felt. 2.1. Loading, reloading, unloading d) "Locked breech" gap (similar to head space) - Turn the weapon, without magazine, to di­ Charging the magazine rect the magazine opening upwards a) Without magazine charger: - Perform vigorous loading action repeate d­ - Press cartridges singly into the magazine ly by hand. - Check the gap on the left hand side bet­ b) With magazine charger and cartridges in ween the breech head and the director belt: shaft at locked breech position, using - Place magazine charger on the magazine the gauge provided. - Place full clip in the magazine charger, and press all the cartridges into the ma­ gazine together. - 14 - - 15 - Loading - (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 -· - 16 - - 17 - 2.3. Sight adjustment 3. Technical Data - Only make corrections when the deviation off aim has been determined definitely. Dimensions - Point of aim is corrected by elevation and lateral adjustment of front sight as follows: Calibre 7,62 x 51 rnrn (. 308 Win.) - Slacken the lock screw in the sleeve of the Overall length of rifle 989 rnrn (40") barrel casing. Barrel length 479 rnrn (19,9") - Elevation adjustment (using key) : Rifling pitch 305 rnrn (12") Number of rifling grooves 4 - Deviation below target - Turn front sight to the right Weights - Deviation above target - Turn front sight to the left Rifle with hand rest cap 4330 g (9 lbs 10 oz) - Lateral adjustment: Rifle with bipod 4520 g (10 lbs 1 oz) - deviation to the left - Shift front sight mount to the left Empty steel magazine for 5 rounds 160 g (5 1/2 oz) - deviation to the right - Shift front sight - 10 rounds 210 g (7 1/2 oz) mount to the - 20 rounds 300 g (10 1/2 oz) right Sling, complete 120 g ( 4 oz) Telescopic sight with mount 630 g - Tighten lock nut (1 lb 6 1/2 oz) again when the adjustments have been made Ballistic data (average) Muzzle velocity 790 m/sec (2600 ft/sec) Muzzle energy 300 m/kg ( 217 o f t I lb ) Shoulder recoil 0,85 m/kg (5 ft/lb) - 18 - Sights Sight base (rear sight - front sight) 540 mm (21") Rear sight (aperture type) - with range adjustment 100-600 m (109-650 yd) - graduated for every 100 m (109 yd) Front sight lateral adjustment -+ 2 o/oo Front sight elevation adjust­ ment + 2 o/oo Telescopic sight: - Magnification 4 X - Scope diameter 25 mm (1") - Visible field at 100 m 12 m ( 13 yd) - Lateral adjustment + 14 o/oo - Elevation adjustment + 23 o/oo ~306 ~ ~ \ ~~ 202 ~ I 204<>-~..j ·. I 204~202 ~ 6 709 709 ~ ~5 .