Not really, one just have to know what details to look for.Sturm78 wrote:
It is very difficult to me differenciate between the different models of Finnish Mosin-Nagant rifles....
For example in this case:
1. Check rear sight - that is Finnish tangent rear sight (designed by Harry Mansner) with a high sight base, it was only used in rifles m/28-30 and m/39.
2. Check upper (closer to tip of barrel) barrel band - it is the type only used in rifles m/28 and m/28-30.
-> Result: The rifle is m/28-30.
- Check rear sight - it is Russian Konovalov m/1910, design used in rifles m/91, and slightly modified version in rifles m/91-24, m/27 and m/28.Here, another image from SA-Kuva archive (123542)
- Check front sight and upper barrel band - old unprotected front sight and barrel band are types only used in infantry rifle m/91, cavalry rifle m/91 and infantry rifle m/91-24.
- Check location of rifle sling attachment slot in front part of rifle stock - it is about half-way in between of upper and lower barrel bands, hence this cannot be cavalry rifle m/91 (which has the particular slot closer to upper barrel band).
-> Result: The rifle is either infantry rifle m/91 or infantry rifle m/91-24. Most likely it is infantry rifle m/91, since there are no stepped barrel and the front sight blade seems to be rather small.
Jarkko
As you can see, it is not really that difficult. 
