This thread has just convinced me to putter around with one of these uppers. It can be costly spending time on the computer.
Don't do it, cuzz I might be tempted. That said, I'm going 300 Blackout, just cuzz BCG/Mags are the same and I have a bunch of both.
I went back and forth trying to decide. There still might be room for a 300BO for me also.
One thing about the 300BO that caught my attention, it's possible to chamber and fire a 300BO round in a 223/5.56 chamber. There are pics of kabooms out there. That's not a deal-breaker for me, but good to be aware of, and always double check what's what.
