What changed on the barrel? An AR is barrel + parts case + HMI.
You guys need to read the OP before posting questions that have already been answered
The UK rifle spots a 16" SS barrel with a guaranteed accuracy of 1.5 MOA out to 800m, with 155gr Scenar match. The civilian version will initially come with a 16" chromlined barrel - and later with a 18" version. The bolt carrier will be chromelined. The rifle uses SR25 magazine system. Like the MRP, the barrel is interchangeable.