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

"Chang Bo, go to the bullets section and pack 110 of 9mm bullets and 110 of RIP bullets for the customer," Mark ordered the teenager as a routine customer in silk robes was standing before him.

"Oh, it looks like you have another servant, Owner Lu." The customer casually commented while staring at the back of Chang Bo.

"He's the only one, Mr. Zheng." Mark clarified him. "Allen and Alina are my siblings. Don't group them with him."

"Ah, that's right. I apologize," The customer clearly didn't believe it, considering the behavior of the Androids towards the owner but he cannot mess with the owner either. So, he gave a fake apology and waited in silence.

Zheng Ha never bought any weapons except for P-226 and his overall transaction amount is down below 200 gold coins. So, he wasn't an exclusive customer.

Parents at the store (part-1)