There are two groups of shoulder stock guns with a normal barrel length. The first group was made around 1905. Several of these are known.
Here is a picture of a 1905
The second group is 1913-1915 or just prewar and into the first years of the war. There were several other designs with non-standard barrel lengths, but more on that in later posts.
As to the short revolvers, this is the first pre WWI I've been able to examine.
The shortened revolver was developed before the Great War in the 1911-1914 period (There exists a gun dated 1911). Up to the revolution a small number of these revolvers were made, and received into service for several categories of police.
As to what happened to them, I suspect that these were either "used up" or became second model MTs-4s. It is unknown how many were produced before the war.
The 1911 gun is virtually identical to the post Great War guns.
When I get more pictures ready, I'll show the differences.
Joe