Izhevsk 1914 M1891

[fernleaf]

I don't believe the circle B is a Bulgarian mark. The Bulgarians peened out or ground off the Imperial Russian crests and typically stamped the wood with "pine cone" marks.

The peening of the Russian Imperial crest was done in Bulgaria post-WW2.

The rifle in question was in Finnish hands in WW2, so any Bulgarian use of the rifle was earlier than 1918. The pine cone and 'circle B' would have been added when the rifle came into Bulgarian hands after being captured by the Austrians during WW1.