Alexander goes over Specna Arms' M-series airsoft rifles in this Airsoft-RUS video, categorizing them into four distinct lines: Flex, Core, Edge, and Prime. He talks about the variations in price, external materials (from polymer to aluminum), internal components like gearboxes and hop-up chambers, and electronic systems across these lines. From there, he guides viewers through the specific features and upgrades of each series, ultimately helping potential buyers determine which model best suits their budget and desired airsoft experience, noting that all models include smart electronics and an electronic trigger.