I did not write that gun description I just got it from Wikipedia

Quinn stepped out of the car and swallowed hard "Good luck miss Quinn" Alfred said before driving off
"Luck?! Why do I need luck?" She cried pulling the sleeves of her black hoodie to her fingers, her brothers chuckled and led her into the school, and Quinn was hit with the school 'spirit', The corridor walls were clad with lockers and the hall was full of kids on their phones "school's weird" she commented
"You've been to school before!" Tim commented
"That was military school where we got up at 3am and just hit the gym plus I wasn't there long before we were sent out, we were the alpha division I'm the last survivor" she muttered her mood going down but she perked back up and walked to find her locker, leaving the boys to trail behind her.

Quinn entered her second class which was history and sat at the back, at the front a woman came in she had long brown hair and she wore a floral dress "ok class we will be learning about ww2 today" she announced
Great! Yes let's teach the kid who went to war about war! Way to trigger PTSD Quinn thought.
"Now can anyone tell me what this is?" She asked pointing to a picture on the board
"A gun" said a tall, lanky boy who had his arm around a blonde girl in a cheerleader outfit
"Yes but anyone know anything else?" Asked the teacher
"It's a The MP 18, manufactured by Theodor Bergmann Abteilung Waffenbau, was arguably the first submachine gun used in combat. It was introduced into service in 1918 by the German Army during World War I as the primary weapon of the Sturmtruppen, assault groups specialized in trench combat. Although MP 18 production ended in the 1920s, its design formed the basis of most submachine guns manufactured between 1920 and 1960." Quinn said from the back, all heads turned to her and she shifted uncomfortable
"How on earth did you know that?!" The teacher cried
"Because in the army they teach you those things" she said casually "I used an updated version of one actually"
"Hey you're that new kid from the army aren't you!" Said one girl at the front, Quinn nodded in confirmation
"Cool! Ever killed anyone?" Asked the a boy who looked he stayed in his room gaming 24/7
Quinn tensed up as the faces of all her kills flashed infront of her eyes,
"Yes I have they haunt me every day and it's not cool... would you think it is cool to see your friends die infront of you," she growled getting up from her seat and crouch down infront of the boy "how about if you see your own twin brother get shot by over fifty rounds because of your plan?" The boy gulped and shook his head
"But it must have been a thrill" said a girl, Quinn span around to her and raised her shirt slightly revealing a ugly scar "this look like a thrill? Gas attack not many had their masks on. Dead. Oh and then some moron lit a match, It didn't feel like a thrill when the air around me set on fire" she growled the room was silent.

"So how was history?!" Tim asked enthusiastically
"Great! scared a lot of people... they thought war was cool so I gave them a piece of my mind" she said leaning against her locker the boys sighed
"Hey Dick! Tim,Damian!" came Artemis's voice "oh cool you come here too! I heard about history, nice!"
Quinn smiled at the girl and her friends who had materialised behind her
"Thanks I just put them in their place" Quinn answered and the friends nodded
The break bell rang and the group dissolved outside, Quinn moved to the very edge so she was not too far but far enough to be away from people, she slid under a tree and pulled out her history book and started to sketch a MP 18 she was so engrossed in it she didn't notice a boy hanging upside down looking over her shoulder
"Wow you're good!" He muttered, Quinn yelped and stared up at him
"Jesus Christ don't do that! Why are you hanging upside down?!" She cried, the boy laughed and he dropped down next to her "Hi I'm Leo!" He greeted
"Quinn" she responded
"What you drawing?" He questioned
" A World War Two gun"
"Hey are you the kid who went to war?" He asked Quinn groaned another kid thinking war is cool!
"Yes"
"I'm sorry to hear that... it must have been hard and I'm sure you lost many good people" he consoled Quinn raised an eyebrow
"Thanks most people just say that they think it's cool and god that annoys me" she explained Leo nodded and the two sat in comfortable silence whilst Quinn drew and Leo observed her a grin on his face, then she drew a portrait of them under the tree.

Leo was impressed with her ability to draw and found it cool how she drew them in colour and all, but he soon noticed she hadn't yet given herself a face "where's your face?" He asked, Quinn grimaced
"I-I don't really like my eyes or grin  so I choose not to draw them" she explained
"What no! You have beautiful eyes" he cried and Quinn smirked "and see a beautiful grin! Why wouldn't you like them?"
"They look a lot like my parents and uh they were -...angry" she stumbled, Leo gasped knowing what she meant and Quinn just ran a hand through her hair "but don't worry I live with Bruce now! And I have brothers and I'm ok" she reassured Leo nodded though still uneasy
"Well I think you should put you face in their because I love your eyes and smile" He smirked, Quinn nodded and drew her face in and placed the drawing in Leo's bag, then a rumble came from Leo's stomach and the two laughed "do you not have lunch?" Quinn asked Leo shook his head
"Nah I don't like to eat at school, I'll make myself some dinner later though my parents are out so I'll probably have pizza" he confirmed
"Oh so you're alone tonight? Me too my brothers and Bruce are out for business at the Wayne tower and Alfred is visiting family and god knows what my other brother is doing so ... hey you want to come over? We can make some dinner" she asked a little shyly, Leo nodded enthusiastically but the bell rang separating the two until dinner.

Quinn opened the door to see Leo smiling at her "well hello there madam" he greeted Quinn snorted and let him in "now what do you want to eat? Because I can't cook.Can you?" She asked leading him to the kitchen Leo laughed
"I can indeed, let us cook!" He cried and they set off chopping ingredients and singing to the music on the radio, in the end they had made two fajitas and they sat on the sofa watching lady and the tramp.
They jumped when they heard Dick's cough behind them, they turned to see the boys and Bruce scowling at Leo like he was a threat to her and behind them was Diana who was scolding the boys " you must be the friend" Bruce commented Leo nodded nervously
"Y-yes sir" he stuttered, Quinn glared at her brothers and Bruce until they sat down on the sofa and Diana sat by Quinn
"So what did you have for dinner?" Tim asked noticing the plates
"We made fajitas, I taught your sister so she should be able to make them for you" Leo said, Tim nodded and reached out a hand which Leo shook
"I'm Tim"
"Leo"
"I'm Dick" he said shaking Leo's hand and Damian followed but added a scowl with it " Damian"
"Well you know I've gotta be off... see ya at school Quinn!" Leo said, Quinn waved as he left the room
"Boys you can't go scowling at all of her friends!" Diana scolded
"We can if he's a guy"Jason said popping out the window, Quinn raised an eyebrow but she had learned not to question it. Quinn face palmed and headed to bed.