On the only other AR-15 I've ever owned, I had put a fluted Olympic Arms Stainless Ultra Match (SUM) barrel on it and it was a tack driver!
Made the mistake of selling it off to be able to afford an Armalite AR-10, but decided that .308 was just too heavy to tote around in the woods for very long.
Bought this current fluted Olympic 5.56 barrel at the Puyallup gunshow and then found my new Sig Sauer M400 at the same show 15 minutes later to put the new barrel on.
This is a nice barrel but I would still like to find a fluted 16" mid-gas Wylde chambered barrel sometime down the road just for the heck of it.
You did the right thing by "hanging on to" your new barrel.
...now learn how to post some pictures of it!