How long is barrel and do you have a pic? I'm deciding between the 300 bo and maybe a 6.5 grendel. Just like the thought of having two different upper change outs for one lower. If I get the grendel I would want a very nice barrel.Im a big fan of the BO. Get one with pistol gas and has the largest gas hole you can find. May have to run an adjustable gas block though. Easy enough to do though. I run BCA because Im poor and they seem solid quality. I have a 300 BO BCA barrel that works well.