I am building an A1 superlight barreled upper .... I had decided on the Olympic barrel for accuracy, but then I thought, this is more of a utility rifle.... maybe I should use a bushmaster chrome lined superlight barrel? Are the Bushmaster chrome lined barrels quite accurate? Doesnt Bushmaster use slightly looser chambers for more reliability?
First off you're looking to build a carbine with a lightweight barrel.
Do you really expect 'tack driving' accuracy? Do you really need tack driving accuracy?
If you NEED the accuracy then look to a heavy match barrel in stainless (Oly has some reasonably priced SUM barrels).
Otherwise the Bushmaster chrome lined superlight is what you want. It is plenty accurate, and I seriously doubt if you are a good enough shooter to notice the accuracy difference between a chrome lined Bushy and the unlined OLY (no flame but a statement of fact).
Yes the Bushmaster will be more reliable.