[doorgunner69]

Only fired the M16-A1 and it was full auto with no burst. Never fired a burst version, those came much later.

I could see the rationale though: it did not take but a bit over a second to dump a 20 round magazine, and the 30 round mags were in the future.

After years of firing the M14, the M16 seemed to have no recoil at all.

[Bikkuri]

If I remember correctly, the M16A-1 was an improved version of the M16 (which had major jamming issues with the water/climate).. and the later version (Stoner) which added the front grip for SF..?
When I came into service 1989, we were issued the AR (no auto)..