Suhl no longer makes Biathlon rifles. Anschutz and Izhmash are the only current producers of high end Biathlon rifles.
The 1827 is the most common. It uses a straight pull Fortner bolt that, if you watch the shooters in the races, is very fast. It is opened with a movement of the wrist, trigger finger on the bolt, and closed with the thumb. Almost as fast as a semi-auto (maybe as fast?). The advantages of the SPB are, in addition to speed, bolt action reliability and the fact that the shooter does not have to alter position to operate the bolt.
Something that you cannot see about those guns is that they are guaranteed to shoot very small groups at -20C (about -4F). Not one of them is inexpensive. A race ready Ishmash will run you about $3200. The race ready Anschutz is about $3600.
The Ishmash custom stocked looks like this:
The stock Anschutz 1827 :
Pete