Hey guys ... first post, been doing lots of lurking and research.
I'm interested in building a .450 AR, but here in NY, we're still under an exact copy of the old '94 AWB, so any upper I got with a threaded muzzle (ie, the Bushmaster factory upper) would need a brake pinned on to "remove the threads" and be legal. While I don't have a problem with that (seeing as my 5.56 tactical AR has a pinned brake), I would rather just avoid that issue all together, and get a barrel without any threads.
I had looked into having Ballistic Advantage cut me a barrel without threads, but a few sites online have mentioned that they no longer make .450BM barrels. I'm planning on giving Bushy a call to see if they will sell the .450 receiver (with the wider ejection port and the .450BM marking) for me to build off of if I can source a barrel, but that leaves me with the question of WTF to do with the barrel itself. So, a few questions:
1. Is there any company that makes .450BM barrels that I could have make a custom barrel without threads?
2. Failing (1.), I'll likely just order a factory Bushy upper and deal with the fact that I have to worry about the muzzle. But I'd like to know, what's the lowest-profile muzzle brake/compensator I can get in .450?