Does the Bushy M4 model have the Mini Y or Ak Brake?
Either one is very loud, and you would do well to get a 16" bare barrel and have it threaded after the ban expires. Otherwise it is a bit of work and money to have it sent off and a new muzzle brake or flash supressor rewelded to your 14.5" barrel.
As for Atlantic Firearms, I've purchased two weapons from them, a DSA Fal and a SAR1. If he has the item in stock you can expect about a week delay before he can get it shipped to you. It all depends on when he recieves the order and what his current shipping days are. If he doesn't have it in stock and is awaiting one from the manufacturer, you might as well sit back and wait, because it's not going to be quick.
If he doesn't have one in stock, then that might mean that he has one tied up in an auction such as Gunbroker or Gunsamerica. He usually won't tell you that because he of course makes more money selling it to you directly since he can bypass the auction folks. So, if he says he's out of stock, then you might want to check the auction sites to see if he has one currently up for sale. That happened with me and my STG58A Carbine. I waited 3 weeks for one, when I could have just bid on the one online and got it for the same price. I found out after I had paid and ordered that he had ones dedicated to auction sales.
You could find better prices for your Bushy if you look around. Try checking over at AR15.com in the EE and Industry section. I'm betting you can find a better deal.
Good Shooting
Red