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

"I need to leave right now due to a situation. Inform Prince Feng that he can send one of the subordinates to our store's branch located at Lunaris city to collect the items on the date we decided."

Mark informed a guard to pass the message to their leader before he gathered Lan Ju and Jinlong (the gold dragon) and teleported away from the village.

Grabbing two of them, Lan Ju took a few continuous teleportations to reach the0 Imperial City's valley street.

Staring at the large mansion from a distance, he said, "Knock out everyone who tries to stop me."

The zheng and the gold dragon nodded in unison and followed him from behind as he walked forward.

The two gatekeepers of Lin Wuying's mansion obviously stopped him at the entrance

"Halt right there. Who are you?" One of the guards who didn't recognize Mark spoke out loud while pointing the spear at him.

Repairing Allen through an upgrade