300 blackout upper for Colt 6920 223/556 lower

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steelfingers

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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.
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.
 

beastep

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I have a 16" on my little girls and a 10.5" on mine. Im sure I do have pics but I would have to find them. I also have a 6.5 but short throats seem to be quite the norm on the Grendel for some reason. Mine is super short but I reload so its not a big deal.
 

chazroh

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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.
I have two Jp barrelled 6.5 Grendel’s and love them. They are pricey, but worth it IMO
 

1911master

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I have a 10.5 BO pistol and it has been flawless thru a couple of hundred rounds of sonic and sub. I really like the BO round for what I do with it.
 

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