Caprivi:
Thanks for the 'heads-up' on the barrel step v sleeving.
Never stop learning!
Just went and checked my Greek military Mannlicher (had to pull the top-wood off!) to see how this works.

Does this imply that all Gibbs MS sporters were made on converted military barreled actions?
Hard to see whether or not the little spring-detent of the commercial actions is present behind the bolt-handle on the photos above.

I need to pay more attention next time I have a named British maker MS sporter in my hands.

My own examples are both commercial: the 1903 has no Brit proof marks, and the 1910 is Brit marked but no gunmaker's name.