In 1923 Finland ordered some barrels for their M1891 rifles from SIG Neuhasen, later they order a heavy barrel also from SIG Neuhasen. These were known as the Model 1924 rifles.
do not know how rare these are but a different variation. These rifles also have had work done to improve the trigger pull.
Later Finland order both heavy and standard barrels from Germany
Photos show the heavy barrel Model 1924