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 or buy coffee on Ko-fi.com

https://www.patreon.com/snowstar

https://ko-fi.com/snowstar5061

Weapon seller in the world of magic

As the masked human was about to step inside, he took a glance to the right from the corner of his eyes and spotted four people in hoods sitting there with blankets on them. It's as if they were beggars.

Stepping inside, he spoke to Mark, in rather a loud tone, "Owner Lu, I'm from Heavens Sect. My master ordered me to bring the weapons. This is the list he provided."

The mysterious masked fellow handed a scroll to Mark as Chang Bo closed down the shutter as he was ordered.

Mark, who had already recognized him, nodded and played along without even taking a look at the scroll, "Is it Elder Jian? It's been a while since we last met."

The masked fellow was a little bit surprised by Mark's response but he shook his head firmly, "not exactly, it's from Patriarch."

"Is that so?" Mark then turned his attention to the teenager who almost closed down the shutter, "Chang Bo, wait."

Taking advantage a loophole in the deal with the Emperor