Snowstar

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet." 
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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Author's current works: War Online, My Soul card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
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You can also support the Author through Patreon

https://www.patreon.com/snowstar

Weapon seller in the world of magic

The spectators standing outside the barrier could just see the explosions, smoke, and the sounds of the gun firing.

With the RPM of M134 minigun set about 3000 beforehand, Mark would finish 1000 rounds chain every 20 seconds. It would take another 5 seconds to set it.

The beasts just ran here and there without even bothering where the attack is coming from, Mark fired randomly without any aim.

Of course, with 50 rounds per second, even if he wants to aim at a particular thing, it's practically impossible unless that target is strong enough to face the mighty firepower of the minigun.

Adding to him, Alina occasionally shot 110m warheads, eradicating everything within 30 meters from the point of impact.

Since normal weapons can also hurt her master and herself, she made sure to target the faraway targets.

Might of M134 minigun