A co-worker told me about the AR he bought at a gunshow last weekend,he said it does not have a dust cover and no means for a dustcover to attach to,and it does not have a forward assist. I asked him to bring it in and show me and sure enough no dustcover and no f a. It is a bull barrel with free float tube and gasblock. There are no markings anywhere to indicate any manufactuer, I asked him to take a pic and email it to me so I could post it here.
He bought it from CMMG.

My question: does anyone know who the manucactuer could be?

DPMS sells slab side uppers receivers. I have a Fulton Armory
upper without a dust cover, forward assist or the case deflector.
I think Fulton get these from DPMS.

Thanks guys,that confirms it for me. My co-worker was told it was DPMS.

It was just that I was not aware of an AR without a dustcover.

Thanks again.