[AndyTheBear]

The study concluded that, if troops aimed higher, and fired two shots, they would have a better chance of dropping people right away.

Why fire two quick shots instead of using the three round burst (provided the current M16 have this, the last one I used was the A2)?

[Spktyr]

The A3 has the 3 round burst and NO full auto setting, which is much disliked. The A4 has three setttings (single, three, full) or two (single, full), if memory serves.