I believe it's Smith who makes one too. Maybe a few others. The "sporter" rifles.
I have a M&P15 Sport with no forward assist. If necessary, the bolt handle will provide the same function. Just give it a slight push.
I wonder what the BCG looks like in this weapon, or any weapon without a FA? You wouldn't need the slots on the side since there was no assist mech.
Personally I prefer the A1 model forward assist. I have had and have seen occasions when it was useful, especially with a dirty weapon.
And what does that offering from Wilson cost...................