They're very hard to find in the USA but in Europe they are nearly as common as Remingtons are here. Very reliable work horses...I own an SBT and would love a set of O/U barrels for it. My friend has several including a recently acquired left hand SBT and and right hand 32" sporting O/U that are for sale.
They are the LX980 models which were distributed under the Verona label but are the same as the Kronos or Z Gun. If interested PM me and I will provide his email address.