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The Bofors 40mm Automatic Gun L-70 on Field Mounting is a close range anti-aircraft weapon, mounted in a single-barrel mounting on a 4 wheel trailer carriage. It is intended for engaging high speed air-craft flying at low altitude, its chief characteristics being high speeds of elevation and traverse combined with a high rate of fire. The gun is normally fired electrically from remote control. It can also be fired electrically from the gun position by means of the Bofors local power control. In case power supply fails, the gun can be operated purely mechanically from the mounting.
The gun is a development of the original 40 mm Bofors gun, the term L-70 referring to the length of the barrel in calibres. Although it is a rapid fire automatic weapon, it can be set for a single shot, It is fed by an automatic mechanism into which 4-round clips are loaded by hand. This ammunition is manufactured to government of India, Ministry of Defence drawing No. IRW 115 GF and Bofors specification number D 200-H (C)
| Total length of ammunition | 534.4mm (max) |
| Total mass of ammunition | 2.4 kg |
| Mass of projectile | 0.96 kg (Approx) |
| Propellant (ACM) | 0.43 kg (Approx) |
| Weight of bursting charge (TNT) | 0.115 kgs |
| Net explosive content | 627.75 g |
| Muzzle velocity | 1000 m/s ± 10 m/s |
| Time for self destruction | 8 sec |
| Rate of fire | 4 rounds/sec |
| Maximum horizontal range | 12600 m |
The ammunition has the following special features :
a) High fire power
b) Long range
c) Increased target effect
d) Rapid target slewing and accurate target tracking
The Fuze FZ 104 assembled into the shells has the following safety arrangements:
a) The striker is held in its position by a supporting cross pin and inner sleeve till it gets an impact.
b) The sleeve provides safety against functioning by rain drops.
c) The stirrup spring of the firing pin locks the rotor in the unarmed position during storage and transport.
d) After firing, the delayed arming pellet prevents the firing pin from being pushed up by its spring to release the rotor, until it is consumed. This ensures a delay in arming at least 60m from the muzzle of the gun.
Due to its sound design and careful manufacture, the ammunition is very reliable for use in combat field environment.
The shelf life of the ammunition is 12 years.
Each round is packed in water proof laminated paper containers, the body & lid of which is closed with two turns of water proof tape adhesive. 12 such containered rounds are packed in one steel box.
| Packing box size | 624 mm x 250 mmx 319 mm |
| Gross weight | 48.0 kgs |
| Net weight | 30.8 kgs |
Volume |
0.048 cu m |
| Cartridge is classified in | |
| Compatibility group | F |
| Hazard division | 1.2 |
| Fire fighting class | 1 |