I am 99% sure that your Bushy HBAR will also not have M4 feedramps which you need to factor into the equation. If I were you I would clean it up (I assume it’s not new) and then sell the entire upper to include BCG.
Then buy a quality upper and BCG from someone else. Otherwise you are just chasing the unicorn.
If that deal is still around I’d say that would pretty much end this discussion; you really could not do much better than that - would be my pick - any time.
Only other option would be to go all new.
That has been my argument for a long time. In a semi auto AR15 a decent stainless steel barrel makes sense, or a standard chrome lined mil spec barrel for a high round count training rifle. I have two with SS barrels and two with standard chromed mil spec and see no real need for the extra expense of a hammer forged barrel.
Damn, you let that deal out! I need to buy one quick now.
Also, I got a little beat up in a thread here not to long ago, for suggesting that CHF might not make that big of a difference in longevity. This is an interesting drift from that.