Basically, the Sporter is a cheaper version of the V3. It has been designed to be only used on sporting rifles with a barrel diameter of maximum 25 mm. Using a suppressor with a Sporter is probably not going to work. The sporter also does not have a rail mount.
Conclusion: if you want to use a MagnetoSpeed on anything other than a ‘standard’ non-suppressed barrel, you have to go for the V3.
Read more here: https://gearlocker.nz/magnetospeed-v3-vs-sportster/