Originally Posted by mikke_26
Does the T4.1 separate upper and lower the same way as the T4?
Yes it does.
Also from a maintenance standpoint, the most important improvements were done internally. The T4.1 bolt and air chamber, as well as trigger group and regulator components are now the same as the T8.1/T9.1. This means that those parts for all 3 are interchangeable allowing for current T8.1/T9.1 owners easier maintenance if they decide to pick up a T4.1.