About a rifle being silenced: this scifi has interstellar travel and atmospheric towers. You can imagine a localized vacuum compartment as a silencer, a railgun, or some other means of accelerating a projectile that is quieter than modern guns.
The twelfth most distant planet from a star was Amoi,
barren and inhospitable. The recently colonized planet only
hosted three cities that neighbored each other— the capital
Tanagura, its urban satellite Midas, and the autonomous sector
Ceres. On the nightside from orbit, they glowed like a small
clustered splotches of light on a dark sphere. Midas shined the
brightest and fullest of them all, while Ceres only had few and
far between specks.
A dark haired young man wearing casual black clothing
perched on the rooftops with a sniper rifle. He was contracted
to assassinate a foreign diplomat and mere opportunity, not
only payment, was more than generous. He was from the
slums of Ceres, a destitute autonomous section off shot from
the city of Midas, and this was the chance he’d take to go
In the distance where the scope was pointed at, the foreign
diplomat conversed with a blond man. The scope aligned with
the target, and shifted upward and to the side to compensate
for the wind and drop.