The question asked was "Is the M16 very different from the old AR-15". The old AR-15 as issued to the SAF in the 70s and early 80s HAS NO FORWARD ASSIST. Unlike you, I actually know this. And how do I know this? Because I was in the SAF long enough to be issued this weapon, plus the SAR-80 after that, Plus the CAR-15 in between for specialist units, plus M16S1. I am a laucheow now, but my memory is still fine. The new AR-15 as sold in the civilian market in the US has the forward assist. But the question is not about the newer AR-15. When you have been proved wrong, just shut up and go into a corner. Instead, you just make yourself lose more credibility with each post.