Can anyone please tell me what this frame is? I got it from a guy who was selling it on my local Craigslist for his son. He says it's an S&M, but I can't really tell. It does have an S&M head tube sticker, but also those of a lot of other brands as well. It came with some S&M parts (Slambars, Pitchforks and a Redneck stem), but the kid built it up himself, so it obviously wasn't a complete.
It's also got these weird little slotted bosses on the sides of the head tube, where welded-on gyro tabs would be, that look as if maybe some type of early removable gyro tabs went there. Can't tell whether the kid added them himself, or if it's some weird factory thing.
Serial #, under the BB, AF00J00873. There's also FA-C stamped near the serial number.
Thanks!