This is old thread, maybe to close.
I’m working with scope now, not finished yet, but some thoughts.
@**JonathanLambert **scope material should be unlit. If not, it will be affected by lighting in weapon location. If is in dark - view will be darker, if is in light - view will be lighter. Unlit solves it.
Shadows. This is problem with rendering optimization. As you can check, shadows are not rendered with high precision on large distance, meshes have own lod and simplicity. Rendering is lower generally. I think it need changes in code but you can try with changing Render Target resolution (small affect, only if current is very low, like a 256x256). Next, in SceneCaptureComponent2D you can find LOD/Detail mode. Default is low, change it to height. It can help a little, but generally, scope view will be always less detailed - mostly. Or it need custom LOD and shadows/Postproess settings for scope only.