It is a variant of a classical Russian IZh-18 shotgun manufactured by Izhevsk Mechanical Plant for export under trademark "Baikal", in Izhevsk, Russia.
It utilizes a cross bolt safety and a selectable ejector or extractor.
The standard model SPR100 has a blued receiver, hardwood stock and fore-end, and a fixed choke.
An upgraded version of the SPR100 has a nickel-plated receiver, walnut stock and fore-end, and screw-in choke tubes.
The SPR100 Sporting model has a nickel-plated receiver, walnut stock and fore-end, and screw-in choke tubes.