Mostly Tacticoolness.
Its a service rifle build, so the optics need to be approved as qualifying for service class.
So you will see fixed power (usually x4) optics on such rifles, either models used by various militaries around the world, clones of, or similar to.
Other scopes will be Elcan Spectres, original Colt x4, Browe BTO, the cheaper but still decent Vortex Spitfire/Burris 332 fixed power scopes.
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