@Kunal Biswas At least I found 1 advantage of having 3 round burst in INSAS, now-a-days soldiers are given bullet resistant vests, here 3 round burst of INSAS will act like TANDEM HEAT warhead. In 3 round Burst, 1 st round will damage the vest in a single point, 2nd round will make a hole in that point which is already damaged by 1st round, the 3rd round will go through hole and hit the human body inside, it is possible because in 3 round burst all bullets will hit a single point, hitting in single point of bullet resistant vest again and again from semi-automatic and automatic mode is completely impossible.
As body armour penetration as a matter of now-a-days so I think we should use 7.62 mm rounds for high armour breaking capacity.
Please clear your inbox, I want to send you message regarding 1971 and 1965 war.
There seems to be a bit of misunderstanding on your part or on the part of the person who came up with the above idea.
The gun is subjected to vibrations, motions on all three axis at any point of time, no matter how still the person may be. The vibrations may be very minute, but they always exist. As a result,
the barrel of the gun under no circumstances can be at the exact same position as a moment before, even if the difference is fractions of a degree.
Further, due to the recoil kick of a gun after firing a bullet, the barrel position is altered considerably, and this affects the next two shots exiting the barrel. This is why the soldier will look into his grouping of shots
Thus you can never hit anyone at the same spot twice.
Having said that, there are three ways of getting that near perfect accuracy that you talk about.
1. Use a floating barrel: This idea involves damping the vibrations reaching the barrel. Here the barrel is allowed to 'float' on springs without any part of barrel touching the main body As a result, the barrel is insulated/shielded from unwanted motion, leading to very accurate shots over long distances.
Also, since the barrel is floating, it invariably moves into its original position after each shot.
Best example, if not the only example is the Barrett series of sniper rifles
2.
Use of Recoil dampeners/shock absorbers: The next way, and also seemingly the only viable way of getting perfect accuracy is this method. As of now this is the domain of the TDI Vector (KRISS Super V) Submachine Gun.
The firearm is designed utilizing an "in-line" approach in which the major internal working components and firing function follow an imaginary line from barrel to stock.
The idea behind the approach is the centralizing of physical forces to work in conjunction with the operator's grip to help reduce inherent recoil and muzzle climb - two detrimental factors to the accuracy of any firearm.
The design approach reportedly results in greatly increased accuracy, recoil reduction (by as much as 60%) and nearly no muzzle climb whatsoever even when the weapon is fired on full-automatic.
In fact, landing one round directly behind the other had been achieved utilizing a KRISS 2-round burst in tests.
3. Electronic firing with multiple barrels: This idea is straight out of a science fiction, but is available as a handgun in reality already. The idea is simple enough. Get multiple barrels to shoot multiple rounds simultaneously before recoil kicks in.
This makes the entire first set of bullets hit with the same accuracy as the first shot, as recoil doesn't kick in until after the bullets have left the handgun.