Noveske offers multiple muzzle brakes and flash hiders, however you’d need to special order one with the BCM comp (provided they do indeed offer it). They also offer them without, but again, they need to be special ordered. They aren’t taking orders from individuals right now, so that means that your options are:
[ol]
[li]Wait and hope that they go through their backlog fast enough to start taking orders, then wait for yours to be built and shipped.[/li][li]Order it through a dealer and hope that Noveske gets through their backlog fast enough to get to your dealers orders, then wait for it to be built and shipped.[/li][li]Order the first 14.5" stainless NSR upper you see, regardless of muzzle device, then send it to Adco or another reputable smith and have them remove the existing device, install and pin a BCM comp, and then send it back to you.[/li][/ol]
Right now is a really bad time to wait for factory offerings exactly how you want them. I’d just buy whatever 14.5" NSR you can find and have it smithed to your specifications.
On a side note, a lot of NSR uppers are coming with Battlecomps and those are relatively easy to find. You may want to give one of those a try before deciding on the BCM comp.
If its a barrel or upper, don’t put it in a rifle until its got a comp pinned. A complete rifle shipped this was would be a problem. I usually get stripped barrels and they are compliant upon completion of assembly before they are ever put on a gun.
For the forseeable future, Noveske will send you to a dealer for ordering. Your best bet is Mike @ ROGTAC, Rainier Arms or Grant at G&R. All are great to deal with, but Mike is simply amazing on the customer service front when it comes to hard-to-get Noveske stuff. I just got an NSR upper from him recently.
Contact Mike Ko directly at ROGTAC. He’ll be able to give you a better indication of what will be available/what’s coming in/and when. Things are obviously crazy right now, but it’s always better to talk to someone vs. relying on web/email updates. Mike is absolutely awesome on this front.
I am not sure if I understand what you were saying correctly but you can’t have an upper receiver w/ a total barrel length of less than 16" in the same house as a lower receiver unless the lower is SBR registered. This is obviously regardless of whether the rifle is “assembled” or not.
I’ve been I contact with Mike Ko at ROGTAC. So far his customer service has been exceptional. My uppers will be ordered. I also had to decide what length NSR rail. I went with the 13.5 after reviewing the pros and cons. I’m getting the Noveske thread caps and will try to get the BCM comp for my gunsmith to put on later.