This is a "HIGHLY" debated subject...some say yes, others say no...and so on.
Most likely you have a chrome lined barrel unless it is a "T" model with a stainless steal barrel...
I have a (pre forward assist) AR-10 A4 C...16" light barrel...when I bought it I followed the "Break In" instructions for a Match barrel, though I did not need too, because I wanted the best possible break in for the highest accuracy possible..That being said, I also used "top quality" ammo for the first 500 rounds, and yes it was expensive but well worth it...The MOA for my rifle is 2 MOA at 100 yards as stated by ArmaLite...I have shot almost 0 MOA (dead center) at 100 yards with it.
Now mind you I do not shoot for "Groups"...I shoot for Total Accuracy, as in one shot move to the next target...or use the same target as if it were a new one.
In breaking in my AR-10, I also lightly oiled the barrel each time it was cleaned in the initial break in, as in one round...10 times, then 5 rounds for the 50, and so on....
It is "VERY MUCH" up to the individual as to how you want to break in your rifle.
My recommendations...Break it in as if were a "Match" grade barrel and use "top quality" ammo to do it...
Think of it like "Seasoning" the barrel, just like you would with a Cast Iron frying pan...To have the best it can be...do it right...
Just my .25 cents worth on the subject....other may vary...
BMS