Those are the MK IIB rifles, sold to the UKin WWI after Canada
's adoption of the SMLE.
sent to the Baltic republics, the Ukraine and Armenia in 1919 to 1921. eventually captured by the SovietUnion between 1921~23 and the fall fo the Baltic republics in 1940.
The only ones of the MK IIIB rifles to come back were the ones sent by the Soviet Union to Spain in 1936.
Small numbers used by the Soviet Union for running bore international competition in the 1950s and 1960s.