I just got the new 1 in 5 twist match 7.5 inch 300 BO barrel.  I have yet to try it out, but curious if anyone else has one and what buffer set up they are using.

I don't know if you ever got this all sorted out, but I have that barrel.  It's dedicated to shooting subs only, so I ended up going with a standard carbine buffer and a Sprinco reduced power buffer spring.

Anyone happen to know the gas port size on this barrel?  I forgot to measure before I assembled it.