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

In an instant, the attack helicopter appeared in everyone's view.

"Is that the flying machine?" The Emperor wondered out loud.

"It appears so, Your Majesty." Bai Xun answered him with a nod. He was baffled by its appearance just like others.

Meanwhile, Sui Pen, the elder deployed by the Sui Clan started to shiver. "It's the same thing that injured our Grand Elder."

The Crown Prince stared at the weird-looking object.

Even though he had never witnessed it, the third prince guessed that those blades above the helicopter are the ones that might be the reason the weapon can fly.

Song Yun appeared to be unfazed by its appearance. "This is the new weapon, huh. Nevertheless, with Longwei in my hands, I'm invincible."

Mark got into the rear chamber and Allen became the pilot.

Upgrading the system