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

It was late in the afternoon; Mark was leaning his back at the chair, enjoying the peace while caressing the back of a golden furred cat. "Man, after roaming here and there for days, I missed the feeling of being lazy…"

Tishanan was comfortably sleeping on Mark's lap.

Maybe, it's the seven points of luck that are working on. Or maybe, it's because the news of the return of Mark was already spread all over the city. Whatever the case, Mark's business was faring even better than the previous day.

From the morning, he had sold about 600 bullets, 4 P226, 1 P365, 12 single-shot, 7 revolvers, 5 Fragmentation grenades, and 8 smoke grenades.

Combing with daily 500 gold coins worth of weapons from the Lin Clan, overall, the store's income crossed more than 1000 gold coins within 10 hours of opening.

With a 60% share of the earnings, he added several hundreds of gold coins to his account.

An advanced payment from Feng Wu