I have a 16" ion-bonded SS mid-length barrel that has been set up with iron sights, though I just put an EOTech on the rifle. My local range has 50 and 100 yard distances, and at those, it shoots quite well (ie accurately) I have run the gun through two half day AR classess (about 500 rounds each) with no issues.
It sounds like your set up will be different, but for the sake of "more info is better," I will say that the barrel does have some heft to it. Nowhere near as heavy as my 20" SS heavy (Rock River). But I am storing a friends LMT Defender Standard Model 16 (which is carbine length, with standard barrel grip vs my Magpul), and that rifle swings up much easier; presumably becuase of the lighter barrel.
When I bought the barrel (as a complete upper), I wanted an accurate shooter––hence the SS. If I were to do it again, I might go with a lighter, chrome moly barrel and save on the weight. Plus, I'm not sure my skill or stye of shooting would make any decrease in accuracy an issue...