>>64391320
Didn't feel right to me that the G11 had no a way of sealing the chamber, and on reviewing a Jim Schatz presentation I found out that it used a very similar two-part chamber, sometimes called a floating ring seal; pp. 26, 30
https://www.forgottenweapons.com/wp-content/uploads/2013/07/Caseless-Ammunition-Small-Arms.pdf
Bear in mind that the G11's chamber also rotated, so obturation could be improved with a system that's more stable in the long axis. Additionally, the hermetically sealed dolphin design that it used isn't trendy anymore; you might not need the pressure relief valve in a modern adaptation. Electronic firing may also be employed, which would address the issue of sealing the firing pin and confer other benefits.