Pc compatible scopes have "Standard Specular Setup" built-in shader.
Mobile version scopes;
Mobile compatible scopes have "Mobile/Bumped Diffuse" built-in shader.
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8X, Acog and CCO have their own Camera and Canvas Component inside prefab for clear sight. Scope zoom properties can be changed easily by changing child Camera component's "Field of view" property.
Holo, RDS and RedDot do not need a Camera and Canvas inside prefab. These scopes just use Glass with Standard Shader "Fade" Rendering Mode.
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Any scope's Pc and mobile prefabs use it's own different texture and mesh.