That's an interesting option.....
I just did an 11.5 and my buddy with a pair of 6920's was looking into buying a sbr upper.
Notice any difference when comparing the two?
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Well, I like the 11.5" and the 10.5 (.3)" barrels a lot. I doubted their fortitude in the past, but I killed a plenty of pigs with my DD MK18 (which is for sale). good shots always= immobilized or DRT.
So for me, the question is: What is the shortest 5.56 barrel I can have and still feel confident with? the answer: 10.3/5 for me.
That being said- the 11.5" upper's only pitfall is that you can't call it a mk18
Here are a few pigs I shot this morning.
http://i58.tinypic.com/oi812v.jpg
You just need to find the best buffer and it will run like a champ. If you don't mind playing with it a bit your good to go. Chances are a 2, or 3 buffer will make all issues disappear. Or run a A5 I gut be the ticket.
PB
1 inch is not going to make or break you amd BCM makes good stuff
Not enough rounds through BCM yet , but through the 100 or so but ,so far very light, pretty soft shooting as expected (BCM 11.5) Neither seem violent at all and extraction/ejection is positive with both , the shock i guess is expecting the MK18/colt upper to be more abrasive and it was quite the opposite with Standard H buffer right now.