Yes, Les Baer carries uppers without forward assists.
I have a flattop model, and they retail for about $100, stripped.
I'm running mine without the dust cover as well as part of a fixed magazine AR pistol.
I also have 2 DPMS lo-pros and like them very much, but they are slightly heavier than the standard flattops due to the significantly thicker sidewalls.
Pros: theoretically less weight, one less part to add to a stripped upper
Cons: it isn't really a thinner profile for the the brass deflector is still there on the Les Baer model.
The upper required a lot of fitting to a non-Les Baer lower, but the result is a super-tight matchup.
No forward assist when you may need it (obviously) -- this is an issue with a finicky AR pistol recoil spring assembly often failing to fully close the bolt carrier in semi-auto fire. (I haven't tried my stronger recoil spring yet) It may or may not be an issue for you.
Having tried the standard flattop upper sans the f/a route, I would recommend against it (unless you use the lo-pro).
Cheers, Otto
(just checked
www.lesbaer.com/pricnga.html $108 stripped.