$160 for a BCG and charging handle from PSA (PSA often puts BCG's on sale for much cheaper). You must be new to AR's, this particular upper may not be what you want, but $520 for a completed non-5.56 upper with a hammer forged FN barrel is, in fact, not a bad deal. If you've ever used a magnified scope on an AR with front sight post, you know that you can't see the front sight post at any magnification above 2x or so. The 6.8 AR that I used for hunting had a front sight post, and it didn't interfere with my 2-7 scope, even if it had it would have been easy enough to remove. For the record, some folks still like to have an iron sight option... even/especially on hunting rifles. The AR's you posted would not be my choice for another hunting 6.8 AR due to their unnecessarily heavy barrels. A heavy contour barrel is not going to provide you with any more hunting accuracy over the few shot's you'll take in the woods than a thinner contour. One of the things I really liked about my 6.8 AR was that with it's 18" thinner contour barrel, it was very light and handy in the woods. I've had HBAR AR's as well, and wouldn't chose one for a hunting carbine. I mostly suggested the PSA because you were limiting your cost to $500, and it's a good option in that price range. Without a hard price ceiling at $500, I would personally pick up a quality AR performance or Bison Armory Barrel and build an upper.