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Inspired by Classic Fallout Weapons Remastered 
The Sniper Rifle Mesh is one of those I like to referr to as "unstable", where for no discernable reason it won't export properly from Blender. Every other part from other models work perfectly fine, but some (including This Machine, the FO3 AR, the FO3 .32 Pistol, the Gauss Rifle, the Dead Money BAR and many more) will only export without any missing features (material data, lighting data, textures) if you copy it into another .NIF file. I managed a workaround by joining all the meshes together into one, then exporting it with messed up UV-maps reimporting it, deleting the non-SR meshes, reexporting it and then copying the NiTriShapeData onto the original SR mesh. 
Long story short: fuck Blender, almost lost a whole evening's worth of work