So I've built 2 different AR style rifles, one in 5.56 and the other in .308 Win. And I've seen some custom rifle companies who are starting to produce long range AR's chambered for .300 Win Mag. Does anyone know anywhere to get parts for these? I would like to build one but I'm having trouble finding anyone who carries such parts. I'm sure it's because the .300 WM AR's are a fairly new thing and the big companies aren't producing parts yet but I just wanted to see if anyone else might have any info. Thanks!