I looked at the first four weeks and thought three weren't just winnable--but wins. (Of course, I got the last two wrong on the specifics.)
At the beginning of the year, I thought the Bills could beat any of the four NFC East teams on the schedule--not that they would, but that they could; i.e., they are "winnable" games in my mind. Southern Maryland might be 3-1, but I'm not a believer.
The Jets in Buffalo don't scare me as much as perhaps they should--they do have a very, very good defense. But I can also see Sanchez having a pick-fest out there. It's a winnable game, IMO, although maybe not as winnable as the three against the NFC East.
I'm going to say 3-1 again. Possibly 2-2. No way worse than that.