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

For a while, Meng Tao didn't speak anything and consulted the Qilin's spirit for advice.

The Qilin slightly hesitated at first but then, it thought that there isn't much to lose in answering some questions and agreed to the deal, which was heavily leaning on its host's side.

After the wager was finalized between the two of them, they waited for the signal.

Soon, the waiting time is over and the proctor blew the whistle.

Meng Tao clicked the trigger to shoot the warhead at his opponent and leaped in a backward direction to increase the distance as soon as the match started.

Mark quickly raised the elevated angle of the machine gun and shot 100 rounds of ether bullets in just a fraction of a second.

As soon as a bunch of bullets simultaneously struck the incoming warhead, it triggered detonation. A large explosion occurred in mid-air, taking Meng Tao by surprise and throwing him off his balance. He crashed onto the floor.

Dragon Warrior Tournament (part-5)