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R16A4T has a heavy barrel look at the picture (zoom in ) of the barrel between the handguard and the flash suppressor on both and you will see the difference
Jesse, the R16A4T has an H-BAR "Heavy Barrel and the has an M4 Barrel. The difference is pictured here : https://www.google.com/search?q=hbar+vs+m4+barrel&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjKqObP0drgAhXmmuAKHRhuAPUQ_AUIDigB&biw=1280&bih=596#imgrc=hyg22w8oR9j4AM:
The Barrel profile is the only difference. I suggest you get the heavy barrel version. It is a few ounces heavier, overall, but the heavy barrel will give you better service, and more accuracy in sustained fire.