Groundless - Sekigan no Sogekihei

Groundless - Sekigan no Sogekihei summary:

The Civil War continues to wage on the island nation of Alistria.
The Waldrons lead a small arms shop on this island when they receive a large rifle order from the army.
However, this turns out to be a ploy by the colonel who made the order.
He uses his ties to the rebel army to have them ransack the shop.
Having her husband killed, her daughter taken away and her own left eye lost,
Sophia Waldron decides to take the only remaining sniper rifle and sets out for revenge!